Thermosetting compositions containing alternating copolymers of isobutylene type monomers

ABSTRACT

A thermosetting composition that includes an ungelled copolymer composition and a crosslinking agent. The ungelled copolymer composition includes a functional group-containing copolymer that includes segments of alternating residues derived from a donor monomer composition comprising an acceptor monomer composition. The donor monomer composition includes one or both of isobutylene and diisobutylene, and the acceptor monomer composition includes acrylic monomers and monomers containing functional groups. The ungelled copolymer composition is substantially free of transition metals and Lewis acids, and the copolymer is substantially free of maleate-type monomer residues and fumarate-type monomer residues. The crosslinking agent has at least two functional groups that are reactive with the functional groups of the copolymer. The thermosetting composition may be in liquid, powder, or dispersed form and may be applied by traditional or electrocoating methods.

This is a division of application Ser. No. 10/077,645, filed Feb. 15,2002 now U.S. Pat. No. 6,784,248.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to thermosetting compositionsthat contain copolymers of vinyl monomers. More specifically, thepresent invention is directed to thermosetting compositions that containfunctional copolymers containing isobutylene type monomers.

2. Description of Related Art

Reducing the environmental impact of coating compositions, in particularthat associated with emissions into the air of volatile organics duringtheir use, has been an area of ongoing investigation and development inrecent years. Accordingly, interest in high solids liquid and powdercoatings has been increasing due, in part, to their inherently lowvolatile organic content (VOC), which significantly reduces airemissions during the application process. While both thermoplastic andthermoset coating compositions are commercially available, thermosetcoatings are typically more desirable because of their superior physicalproperties, e.g., hardness and solvent resistance.

Low VOC coatings are particularly desirable in the automotive originalequipment manufacture (OEM) market due to the relatively large volume ofcoatings that are used. However, in addition to the requirement of lowVOC levels, automotive manufacturers have very strict performancerequirements of the coatings that are used. For example, automotive OEMclear top coats are typically required to have a combination of goodexterior durability, acid etch and water spot resistance, and excellentgloss and appearance. While liquid top coats containing, for example,capped polyisocyanate and polyol components, can provide suchproperties, they have the undesirable drawback of higher VOC levelsrelative to higher solids liquid coatings or powder coatings, which haveessentially zero VOC levels.

Coating compositions containing polyol and capped polyisocyanatecomponents, (“isocyanate cured coatings”) are known and have beendeveloped for use in a number of applications, such as industrial andautomotive OEM topcoats. Such isocyanate cured coating compositions aredescribed in, for example, U.S. Pat. Nos. 4,997,900, 5,439,896,5,508,337, 5,554,692, and 5,777,061. However, their use has been limiteddue to deficiencies in, for example, flow, appearance and storagestability. Isocyanate cured coating compositions typically include acrosslinker having two or more capped isocyanate groups, e.g., a trimerof 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane cappedwith e-caprolactam, and a hydroxy functional polymer, e.g., an acryliccopolymer prepared in part from a hydroxyalkyl acrylate and/ormethacrylate.

Electrodeposition as a coating application method involves deposition ofa film-forming composition onto a conductive substrate under theinfluence of an applied electrical potential. Electrodeposition hasbecome increasingly important in the coatings industry because, bycomparison with non-electrophoretic coating means, electrodepositionoffers increased paint utilization, improved corrosion protection, andlow environmental contamination.

Initially, electrodeposition was conducted with the workpiece beingcoated serving as the anode. This was familiarly referred to as anionicelectrodeposition. However, in 1972, cationic electrodeposition wasintroduced commercially. Since that time, cationic electrodeposition hassteadily gained in popularity and today is by far the most prevalentmethod of electrodeposition. Throughout the world, more than 80 percentof all motor vehicles produced are given a primer coating by cationicelectrodeposition.

Electrodepositable coating compositions comprising activehydrogen-containing polymers which contain onium salt groups are knownand have been developed for use, inter alia, in electrodepositableautomotive OEM primer coatings. Such electrodepositable coatingcompositions typically comprise a crosslinking agent having at least twofunctional groups that are reactive with active hydrogen groups, and anactive hydrogen-containing polymer which contains onium salt groups.

Functional polymers used in liquid, powder, and electrodepositablecoating compositions are typically random copolymers that includefunctional group-containing acrylic and/or methacrylic monomers. Such afunctional copolymer will contain a mixture of polymer molecules havingvarying individual functional equivalent weights and polymer chainstructures. In such a copolymer, the functional groups are locatedrandomly along the polymer chain. Moreover, the number of functionalgroups is not, divided equally among the polymer molecules, such thatsome polymer molecules may actually be free of functionality.

In a thermosetting composition, the formation of a three-dimensionalcrosslinked network is dependent on the functional equivalent weight aswell as the architecture of the individual polymer molecules thatcomprise it. Polymer molecules having little or no reactivefunctionality (or having functional groups that are unlikely toparticipate in crosslinking reactions due to their locations along thepolymer chain) will contribute little or nothing to the formation of thethree-dimensional crosslinked network, resulting in decreased crosslinkdensity and less than optimum physical properties of the finally formedthermoset coating.

Many patents express the potential for using isobutylene-containingpolymers in coating compositions. For example, U.S. Pat. No. 6,114,489to Vicari et al. discloses a coating composition that includes afunctional acrylic resin binder; a co-reactant capable of reacting withthe functionality of the acrylic binder; a degasser; and a hyperbranchedpolyester flow and leveling agent. Isobutylene is suggested as apotential co-monomer for use in the acrylic binder as part of a longlist of monomers. U.S. Pat. No. 5,552,487 to Clark et al. disclosespowder coating compositions that include a copolymer having a reactivefunctionality and a suitable crosslinking agent capable of reaction withthe reactive functionality of the copolymer. The copolymer is a made bycopolymerizing functional monomers with other monomers, isobutylenebeing one among many listed as potential co-monomers. Although only twoare referenced herein, of the many patents that express the possibilityof using isobutylene-type co-monomers, none actually shows or disclosesa working example of such a copolymer.

The fact that no examples of isobutylene-type; monomer-containingcopolymers in coating compositions can be found is most likely due tothe generally non-reactive nature of isobutylene with acrylic andmethacrylic monomers. Reactivity ratios for monomers can be calculatedusing the Alfrey—Price Q-e values (Robert Z. Greenley, Polymer.Handbook, Fourth Edition, Brandrup, Immergut and Gulke, editors, Wiley &Sons, New York, N.Y., pp. 309–319 (1999)). The calculations may becarried out using the formulas I and II:r ₁=(Q ₁ /Q ₂)exp{−e ₁(e ₁ −e ₂)}  Ir ₂=(Q ₂ /Q ₁)exp{−e ₂(e ₂ −e ₁)}  IIwhere r₁ and r₂ are the respective reactivity ratios of monomers 1 and2, and Q₁ and Q₂ and eland e₂ are the respective reactivity and polarityvalues for the respective monomers (Odian, Principals of Polymerization;3^(rd) Ed., Wiley-Interscience, New York, N.Y., Chapter 6, pp. 452–467and 489–491 (1991)). Table 1 shows the calculated reactivity ratios ofselected monomers with isobutylene:

TABLE 1 Monomer r₁ (isobutylene) r₂ Methyl acrylate 0.10 13.67 Glycidylmethacrylate 0.08 34.17 Methacrylic acid 0.09 39.71As one skilled in the art of polymer chemistry can appreciate, when r₁is near zero and r₂ has a value of 10 or more, monomer 2 is reactivetoward both monomers and monomer 1 is reactive toward neither monomer.In other words, it is extremely difficult to prepare copolymers havingsignificant amounts of both monomers. It is not surprising then that noexamples can be found of coating compositions that includeisobutylene-type monomer-containing copolymers, because the monomers donot tend to copolymerize.

In some cases, it is observed that monomers that do not readilyhomopolymerize are able to undergo rapid copolymerization reactions witheach other. The most typical situation occurs when a strong electrondonating monomer is mixed with a strong electron accepting monomer fromwhich a regular alternating copolymer results after free radicalinitiation. Maleic anhydride is a widely used example of a strongelectron accepting monomer. Styrene and vinyl ethers are typicalexamples of electron donating monomers. Systems, such as maleicanhydride—styrene, are known to form charge transfer complexes, whichtend to place the monomers in, alternating sequence prior to initiation.The application of the free radical initiator “ties” the orderedmonomers together to form an alternating copolymer (Cowie, AlternatingCopolymers, Plenum, New York (1985)).

U.S. Pat. No. 2,378,629 to Hanford and U.S. Pat. No. 4,151,336 toSackman et al. disclose that even when a moderately electron donatingmonomer, such as diisobutylene, is copolymerized with a strong electronacceptor monomer, such as maleic anhydride, an alternating copolymerresults.

When a moderately electron donating monomer, such as isobutylene, iscopolymerized with a moderately electron accepting monomer, such as anacrylic ester, poor incorporation of the electron donating monomerresults. For example, free radical copolymerization of isobutylene (IB)and acrylic monomers, has resulted in copolymers that contain at no morethan 20–30% of IB and have low molecular weights because of thedegradative chain transfer of IB. Examples of such copolymerizations ofIB are disclosed by U.S. Pat. No. 2,411,599 to Sparks et al. and U.S.Pat. No. 2,531,196 to Brubaker et al.

Conjugated monomers, such as acrylic esters and acrylonitrile, have beenshown to react with monomers such as propylene, isobutylene, andstyrenes in the presence of Lewis acids, such as alkylaluminum halides,to give 1:1 alternating copolymers. The alternating copolymers wereobtained when the concentration ratio of the Lewis acids to the acrylicesters was 0.9 and the concentration of IB was greater than theconcentration of the acrylic esters (Hirooka et al, J. Polym. Sci.Polym. Chem., 111, 1281. (1973)). The metal halides vary the reactivityof the monomers by complexing with them. The electron donormonomer—electron acceptor monomer—metal halide complex leads toalternating copolymers (Mashita et al. Polymer, Vol. 36, No. 15, pp.2973–2982, (1995)).

Copolymers of IB and methyl acrylate (MA) have also been obtained byusing ethyl aluminum sesquichloride and 2-methyl pentanoyl peroxide asan initiating system. The resulting copolymer had an alternatingstructure, with either low (Kuntz et ai, J. Polym. Sci. Polym. Chem.,16, 1747 (1978)) or high isotacticity in the presence of EtAlCl₂ (10molar % relative to MA). (Florjanczyk et al, Makromol. Chem., 183, 1081(1982)).

Another method for making IB copolymers with acrylic esters involvedalkyl boron halide, which was found to be much more active than alkylaluminum halides in forming alternating copolymers. The resultingcopolymer was an elastomer of high tensile strength and high thermaldecomposition temperature with good oil resistance, especially atelevated temperatures (Mashita et al, Polymer, 36, 2983 (1995)).

U.S. Pat. No. 5,807,937 to Matyjaszewski et. al. discloses a method ofmaking alternating copolymers of isobutylene and methyl acrylate usingan atom transfer radical polymerization (ATRP) process. The methodrequires the use of a suitable ATRP initiator, such as 1-phenylethylbromide, and a suitable transition metal salt, such as CuBr with aligand, such as 2,2′-bipyridyl to perform the complex redox initiationand propagation steps of the polymerization process.

Copolymers containing relatively high amounts. (≧30 mol %) of IB andacrylic esters have only been attained by free radical polymerizationwhen Lewis acids or ATRP initiation systems have been employed. Thepolymer that results from such processes requires expensive and timeconsuming clean up to remove the transition metal salt and/or Lewis acidresidues in order to make the polymer commercially useful.

Copolymer compositions that contain Lewis acids and/or transition metalsintermingled with the copolymer can have a number of drawbacks when usedcommercially in coating compositions. First, some Lewis acids andtransition metals are toxic and have adverse environmental effects ifthey are leached from the copolymer: and enter the environment. Second,in coating applications the Lewis acids and transition metals may leadto poor color stability when the coating is exposed to UV light orsimply cause the coating to discolor through other reactions orinteractions. Further, the Lewis acids and transition metals may reactwith other ingredients in a coating formulation resulting in undesiredproperties, such as a shortened shelf-life for a given coatingformulation.

It would be desirable to develop thermosetting compositions thatcomprise functional copolymers having a well-defined polymer chainstructure. In particular, alternating copolymers containingisobutylene-type monomers that are substantially free of Lewis acids andtransition metals would be desirable. Such compositions would have lowerVOC levels due to lower viscosities and a combination of favorableperformance properties particularly in coatings applications.

SUMMARY OF THE INVENTION

The present invention is directed to a liquid thermosetting compositionthat includes an ungelled copolymer composition and a crosslinkingagent. The ungelled copolymer, composition includes a functionalgroup-containing copolymer that includes segments of alternatingresidues derived from a donor monomer composition comprising an acceptormonomer composition. The donor monomer composition includes one or acombination of isobutylene, diisobutylene, dipentene, and isoprenol andthe acceptor monomer co position includes acrylic monomers and monomerscontaining functional groups. The ungelled copolymer composition issubstantially free of transition metals and Lewis acids and thecopolymer is substantially free of maleate-type monomer residues andfumarate-type monomer residues. The crosslinking agent has at least twofunctional groups that are reactive with the functional groups of thecopolymer.

The present invention is also directed to a, thermosettingcomposition-that includes a co-reactable solid, particulate mixture of areactant having at least two functional groups, and a copolymercomposition. The copolymer composition includes a functionalgroup-containing copolymer as described above. The copolymer compositionis substantially free of transition metals and Lewis acids and thecopolymer is substantially free of maleate-type monomer residues andfumarate-type monomer residues. The functional groups of the reactantare different from and reactive with the functional groups of thecopolymer.

The present invention is further directed to a thermosetting compositionthat includes a resinous phase dispersed in an aqueous medium. Theresinous phase includes an ungelled copolymer composition and a curingagent. The ungelled copolymer composition includes a functionalgroup-containing copolymer that includes segments of alternatingresidues derived from a donor monomer composition comprising an acceptormonomer composition. The donor monomer composition includes one or acombination of isobutylene, diisobutylene, dipentene, and isoprenol andthe acceptor monomer composition includes acrylic monomers and monomerscontaining one or more active hydrogen groups and residues from monomerscontaining salt groups. The copolymer composition is substantially freeof transition metals and Lewis acids and the copolymer is substantiallyfree of maleate-type monomer residues and fumarate-type monomerresidues. The functional groups of the curing agent are different fromand reactive with the active hydrogen groups of the copolymer.

The present invention is still further directed to a method of coating asubstrate that includes applying a thermosetting composition to thesubstrate, coalescing the thermosetting composition to form asubstantially continuous film, and curing the thermosetting composition.The thermosetting composition is the liquid thermosetting composition orthe solid thermosetting composition described above. The presentinvention is directed to a substrate coated using the above describedmethod.

The present invention is additionally directed to a method ofelectrocoating a conductive substrate serving as a cathode in anelectrical circuit comprising the cathode and an anode. The cathode andanode are immersed in an aqueous electrocoating composition. The methodincludes passing electric current between the cathode and the anode tocause deposition of the electrocoating composition on the substrate as asubstantially continuous film. The electrocoating composition includesthe thermosetting composition that includes a resinous phase dispersedin an aqueous medium described above. The present invention is directedto a substrate coated using the above described method.

The present invention is also additionally directed to a multi-componentcomposite coating composition that, includes a base coat deposited froma pigmented film-forming composition and a transparent top coat appliedover the base coat. The top coat may be applied using the abovedescribed method of applying the liquid thermosetting composition or thesolid thermosetting composition of the present invention. The base coatmay be applied using the above-described method of applying the presentliquid thermosetting composition, the method of applying the presentsolid thermosetting composition and/or the present method ofelectrocoating a conductive substrate. The multi-component compositecoating composition may have three coating layers where the first coatmay be a primer coat including the present thermosetting compositionapplied using the present method of electrocoating a conductivesubstrate, the second coat is a base coat is as described above and thethird coat is a top coat as described above.

DETAILED DESCRIPTION OF THE INVENTION

Other than in the operating examples, or where otherwise indicated, allnumbers or expressions referring to quantities of ingredients, reactionconditions, etc., used in the specification and claims are to beunderstood as modified in all instances by the term “about.” Variousnumerical ranges are disclosed in this patent application. Because theseranges are continuous, they include every value between the minimum andmaximum values. Unless expressly indicated otherwise, the variousnumerical ranges specified in this application are approximations.

As used herein, the term “copolymer composition” is meant to include asynthesized copolymer as well as residues from initiators, catalysts,and other elements attendant to the synthesis of the copolymer, but notcovalently incorporated thereto. Such residues and other elementsconsidered as part of the copolymer composition are typically mixed orco-mingled with the copolymer such that they tend to remain with thecopolymer when it is transferred between vessels or between solvent ordispersion media.

As used herein, the term “substantially free” is meant to indicate thata material is present as an incidental impurity. In other words, thematerial is not intentionally added to an indicated composition, but maybe present at minor or inconsequential levels because it was carriedover as an impurity as part of an intended composition component.

The terms “donor monomer” and “acceptor monomer” are used throughoutthis application. With regard to the present invention, the term “donormonomer” refers to monomers that have a polymerizable, ethylenicallyunsaturated group that has relatively high electron density in theethylenic double bond, and the term “acceptor monomer” refers tomonomers that have a polymerizable, ethylenically unsaturated group thathas relatively low electron density in the ethylenic double bond. Thisconcept has been quantified to an extent by the Alfrey-Price Q-e scheme(Robert Z. Greenley, Polymer Handbook, Fourth Edition, Brandrup,Immergut and Gulke, editors, Wiley & Sons, New York, N.Y., pp.309–319(1999)). All e values recited herein are those appearing in thePolymer Handbook unless otherwise indicated.

In the Q-e scheme, Q reflects the reactivity of a monomer and erepresents the polarity of a monomer, which indicates the electrondensity of a given monomer's polymerizable, ethylenically unsaturatedgroup. A positive value for e indicates that a monomer has a relativelylow electron density and is an acceptor monomer, as is the case formaleic anhydride, which has an e value of 3.69. A low or negative valuefor e indicates that a monomer has a relatively high electron densityand is a donor monomer, as is the case for vinyl ethyl ether, which hasan e value of −1.80.

As referred to herein, a strong acceptor monomer is meant to includethose monomers with an e value greater than 2.0. The term “mild acceptormonomer” is meant to include those monomers with an e value greater than0.5 up to and including those monomers with an e value of 2.0.Conversely, the term “strong donor monomer” is meant to include thosemonomers with an e value of less than −1.5, and the term “mild donormonomer” is meant to include those monomers with an e value of less than0.5 to those with an e value of −1.5.

The present invention is directed to a thermosetting composition thatincludes a copolymer composition that contains a functionalgroup-containing copolymer having at least 30 mol %, in many cases atleast 40 mol %, typically at least 50 mol %, in some cases at least 60mol %, and in other cases at least 75 mol % of residues of the copolymerderived from alternating sequences of donor monomer—acceptor monomerpairs having the alternating monomer residue units of structure:-[DM-AM]-where DM represents a residue from a donor monomer and AM represents aresidue from an acceptor monomer. The copolymer may be a 100%alternating copolymer of DM and AM. More particularly, at least 15 mol %of the copolymer comprises a donor monomer; which is an isobutylene-typemonomer, having the following structure (I):

where R¹ is linear or branched C₁ to C₄ alkyl; R² is one or more ofmethyl, linear, cyclic, or branched C₁ to C₂₀ alkyl, alkenyl, aryl,alkaryl, and aralkyl. Further, at least 15 mol % of the copolymerincludes an acrylic monomer as an acceptor monomer. The group R² mayinclude one or more functional groups selected from hydroxy, epoxy,carboxylic acid, ether, carbamate, and amide.

Thermosetting compositions of the present invention often have a VOCcontent of less than 4 percent by weight, typically less than 3.5percent by weight and many times less than 3 percent by weight.

Of note in the present copolymer is that the copolymer incorporates asubstantial portion of alternating residues of a mild donor monomer asdescribed by structure I and a mild acceptor monomer, which is anacrylic monomer. A non-limiting list of published e values for monomersthat may be included as monomers described by structure I and acrylicmonomers of the present invention are shown in Table 2.

TABLE 2 Alfrey-Price e values for Selected Monomers Monomer e valueMonomers of structure 1 Isobutylene −1.20¹ Diisobutylene 0.49² AcrylicMonomers Acrylic Acid 0.88¹ Acrylamide 0.54¹ Acrylonitrile 1.23¹ MethylAcrylate 0.64¹ Ethyl Acrylate 0.55¹ Butyl Acrylate 0.85¹ Benzyl acrylate1.13¹ Glycidyl acrylate 1.28¹ ¹Polymer Handbook, Fourth Edition (1999)²Rzaev et al., Eur. Polym. J., Vol. 24, No. 7, pp. 981–985 (1998)

The present copolymer composition is substantially free of maleatemonomer residues and fumarate monomer residues, which typically have evalues greater than 2.0. These types of multifunctional monomers providetoo many functional groups to the copolymer. This can create problems,for example in coatings where a thermosetting composition may have ashort shelf-life due to the overly functional nature of the copolymer.

Further, the present copolymer composition is substantially free oftransition metals and Lewis acids which, as noted above, have been usedin the prior art to make alternating copolymers of mild donor monomersand mild acceptor monomers. The present invention does not utilizetransition metal or Lewis acid adjuncts in preparing the presentcopolymer composition, therefore, they need not be removed afterpolymerization and the resulting copolymer compositions will not sufferthe drawbacks inherent in those that contain transition metals or Lewisacids.

Any suitable donor monomer may be used in the present invention.Suitable donor monomers that may be used include strong donor monomersand mild donor monomers. The present invention is particularly usefulfor preparing alternating copolymers where a mild donor molecule isused. The present copolymers will include a mild donor monomer describedby structure I, such as isobutylene and diisobutylene dipentene, andisoprenol, and may additionally include other suitable mild donormonomers. The mild donor monomer of structure I is present in thecopolymer composition at a level of at least 15 mol %, in some cases atleast 25 mol %, typically at least 30 mol % and in some cases at least35 mol %. The mild donor monomer of structure I is present in thecopolymer composition at a level of up to 50 mol %, in some cases up to47.5 mol %, typically up to 45 mol %, and, in some cases, up to 40 mol%. The level of the mild donor monomer of structure I used is determinedby the properties that are to be incorporated into the copolymercomposition. Residues from the mild donor monomer of structure 1 may bepresent in the copolymer composition in any range of values inclusive ofthose stated above.

Suitable other donor monomers that may be used in the present inventioninclude, but are not limited to, ethylene, butene, styrene, substitutedstyrenes, methyl styrene, substituted styrenes, vinyl ethers, vinylesters, vinyl pyridines, divinyl benzene, vinyl naphthalene, and divinylnaphthalene. Vinyl esters include vinyl esters of carboxylic acids whichinclude, but are not limited to vinyl acetate, vinyl butyrate, vinyl3,4-dimethoxybenzoate, and vinyl benzoate. The use of other donormonomers is optional, when other donor monomers are present, they arepresent at a level of at least 0.01 mol % of the copolymer composition,often at least 0.1 mol %, typically at least 1 mol %, and, in somecases, at least 2 mol %. The other donor monomers may be present at upto 25 mol % in some cases up to 20 mol %, typically up to 10 mol %, and,in some cases, up to 5 mol % The level of other donor monomers used isdetermined by the properties that are to be incorporated into thecopolymer composition. Residues from the other donor monomers may bepresent in the copolymer composition in any range of values inclusive ofthose stated above.

The copolymer composition includes acceptor monomers as part of thealternating donor monomer—acceptor monomer units along the copolymerchain. Any suitable acceptor monomer may be used. Suitable acceptormonomers include strong acceptor monomers and mild acceptor monomers. Anon-limiting class of suitable acceptor monomers are those described bythe structure (II):

where W is selected from the group consisting of —CN, —X, and —C(═O)—Y,wherein Y is selected from the group consisting of —NR³ ₂,—O—R⁵—O—C(═O)—NR³ ₂, and —OR⁴, R³ is selected from the group consistingof H, linear or branched C₁ to C₂₀ alkyl, and linear or branched C₁ toC₂₀ alkylol, R⁴ is selected from the group consisting of H,poly(ethylene oxide), poly(propylene oxide), linear or branched C₁ toC₂₀ alkyl, alkylol, aryl and aralkyl, linear or branched C₁ to C₂₀fluoroalkyl, fluoroaryl and fluoroaralkyl, a siloxane radical, apolysiloxane radical, an alkyl siloxane radical, an ethoxylatedtrimethylsilyl siloxane radical, and a propoxylated trimethylsilylsiloxane radical, R⁵ is a divalent linear or branched C₁ to C₂₀ alkyllinking group, and X is a halide.

A class of mild acceptor monomers that are included in the presentcopolymer composition are acrylic acceptor monomers. Suitable acrylicacceptor monomers include those described by structure (III):

where Y is selected from the group consisting of —NR³ ₂,—O—R⁵—O—C(═O)—NR³ ₂, and —OR⁴, R³ selected from the group consisting ofH, linear or branched C₁ to C₂₀ alkyl, and linear or branched C₁ to C₂₀alkylol, R⁴ is selected from the group consisting of H, poly(ethyleneoxide), poly(propylene oxide), linear or branched C₁ to C₂₀ alkyl,alkylol, aryl and aralkyl, linear or branched C₁ to C₂₀ fluoroalkyl,fluoroaryl and fluoroaralkyl, a siloxane radical, a polysiloxaneradical, an alkyl siloxane radical, an ethoxylated trimethylsilylsiloxane radical, and a propoxylated trimethylsilyl siloxane radical,and R⁵ is a divalent linear or branched C₁ to C₂₀ alkyl linking group.

A particularly useful type of acrylic acceptor monomers are thosedescribed by structure III where Y includes at least one functionalgroup of epoxy, oxirane, carboxylic acid, hydroxy, methylol, methylolether, amide, oxazoline, aceto acetate, isocyanate, carbamate, primaryamine, secondary, amine salt, quaternized amine, thioether, sulfide,sulfonium salt, or phosphate.

Examples of suitable acceptor monomers include; but are not limited to,hydroxyethyl acrylate, hydroxypropyl acrylate, acrylic acid, methylacrylate, ethyl acrylate, butyl acrylate, isobutyl acrylate, isobornylacrylate, dimethylaminoethyl acrylate, acrylamide, perfluoro methylethyl acrylate, perfluoro ethyl ethyl acrylate; perfluoro butyl ethylacrylate, trifluoromethyl benzyl acrylate, perfluoro alkyl ethyl,acryloxyalkyl terminated polydimethylsiloxane, acryloxyalkyltris(trimethylsiloxy silane), and acryloxyalkyl trimethylsiloxyterminated polyethylene oxide, chlorotrifluoro ethylene, glycidylacrylate, 2-ethylhexyl acrylate, and n-butoxy methyl acrylamide.

The acrylic acceptor monomers of structure III are present in thecopolymer composition at a level of at least 15 mol %, in some cases atleast 25 mol %, typically at least 30 mol %, and, in some cases, atleast 35 mol %. The acrylic acceptor monomers of structure III arepresent in the copolymer composition at a level of up to 50 mol %, insome cases up to 47.5 mol %, typically up to 45 mol %, and, in somecases, up to 40 mol %. The level of the acrylic acceptor monomers ofstructure III used is determined by the properties that are to beincorporated into the copolymer composition. Residues from the acrylicacceptor monomers of structure III may be present in the copolymercomposition in any range of values inclusive of those stated above.

Suitable other mild acceptor monomers that may be used in the presentinvention include, but are not limited to, acrylonitrile,methacrylonitrile, vinyl halides, crotonic acid, vinyl alkyl sulfonates,and acrolein. Vinyl halides include, but are not limited to, vinylchloride and vinylidene fluoride. The use of other mild acceptormonomers is optional, when other mild acceptor monomers are present,they are present at a level of at least 0.01 mol % of the copolymercomposition, often at least 0.1 mol %, typically at least 1 mol %, and,in some cases, at least 2 mol %. The other acceptor monomers may bepresent at up to 35 mol %, in some cases up to 25 mol %, typically up to15 mol %, and, in some cases, up to 10 mol %. The level of otheracceptor monomers used is determined by the properties that are to beincorporated into the copolymer composition. Residues from the otheracceptor monomers may be present in the copolymer composition in anyrange of values inclusive of those stated above.

The present copolymer has a molecular weight of at least 250, in manycases at least 500, typically at least 1,000, and, in some cases, atleast 2,000. The present copolymer may have a molecular weight of up to1,000,000, in many cases up to 500,000, typically up to 100,000, and, insome cases, up to 50,000. Certain applications will require that themolecular weight of the present copolymer not exceed 30,000, in somecases not exceed 25,000, in other cases not exceed 20,000, and, incertain instances, not exceed 16,000. The molecular weight of thecopolymer is selected based on the properties that are to beincorporated into the copolymer composition. The molecular weight of thecopolymer may vary in any range of values inclusive of those statedabove.

The polydispersity index (PDI) of the present copolymer is not alwayscritical. The polydispersity index of the copolymer is usually less than4, in many cases less than 3.5, typically less than 3.0, and, in somecases, less than 2.5. As used herein, and in the claims, “polydispersityindex” is determined from the following equation: (weight averagemolecular weight (Mw)/number average molecular weight (Mn)). Amonodisperse polymer has a PDI of 1.0. Further, as used herein, Mn andMw are determined from gel permeation chromatography using polystyrenestandards.

In an embodiment of the present copolymer composition, the alternatingsequences of donor monomer—acceptor monomer pairs are residues have thealternating structure IV:

where R¹, R², and W are defined as above. A particularly preferredembodiment is one wherein the monomer residues containing the group Ware derived from one or more acrylic monomers, and the monomer residuescontaining the groups R¹ and R² are derived from one or a combination ofdiisobutylene, isobutylene, dipentene, and isoprenol. The copolymercompositions of the present invention may also include otherpolymerizable, ethylenically unsaturated monomers.

The copolymer composition of the present invention may have all of theincorporated monomer residues in an alternating architecture. Anon-limiting example of a copolymer segment having 100% alternatingarchitecture of diisobutylene (DIIB) and an acrylic monomer (Ac) isshown by structure V:-Ac-DIIB-Ac-DIIB-Ac-DIIB-Ac-DIIB-Ac-DIIB-Ac-DIIB-Ac-  (V)

However, in most instances, the present copolymer will containalternating segments and random segments as shown by structure VI, acopolymer of DIIB, Ac and other monomers, M:

Structure VI shows an embodiment of the present invention where thecopolymer may include alternating segments as shown in the boxes andrandom segments as shown by the underlined segments.

The random segments of the copolymer may contain donor or acceptormonomer residues that have not been incorporated into the copolymercomposition by way of an alternating architecture. The random segmentsof the copolymer composition may further include residues from otherethylenically unsaturated monomers. As recited herein, all references topolymer segments derived from alternating sequences of donormonomer—acceptor monomer pairs are meant to include segments of monomerresidues such as those shown by the boxes in structure VI.

The other ethylenically unsaturated monomers include any suitablemonomer not traditionally categorized as being an acceptor monomer or adonor monomer.

The other ethylenically unsaturated monomers, residue M of structure VI,is derived from at least one ethylenically unsaturated, radicallypolymerizable monomer. As used herein and in the claims, “ethylenicallyunsaturated, radically polymerizable monomer”, and like terms, are meantto include vinyl monomers, allylic monomers, olefins, and otherethylenically unsaturated monomers that are radically polymerizable andnot classified as donor monomers or acceptor monomers.

Classes of vinyl monomers from which M may be derived include, but arenot limited to monomer residues derived from monomers of the generalformula VII:

where R¹¹, R¹², and R¹⁴ are independently selected from the groupconsisting of H, CF₃, straight or branched alkyl of 1 to 20 carbonatoms, aryl, unsaturated straight or branched alkenyl or alkynyl of 2 to10 carbon atoms, unsaturated straight or branched alkenyl of 2 to 6carbon atoms substituted with a halogen, C₃–C₈ cycloalkyl, heterocyclyland phenyl; R₁₃ is selected from the group consisting of H, C₁–C₆ alkyl,COOR¹⁵, wherein R¹⁵ is selected from the group consisting of H, analkali metal, a C₁ to C₆ alkyl group, glycidyl, and aryl.

Specific examples of other monomers, M, that may be used in the presentinvention include methacrylic monomers and allylic monomers. Residue Mmay be derived from at least one of alkyl methacrylate having from 1 to20 carbon atoms in the alkyl group. Specific examples of alkylmethacrylates having from 1 to 20 carbon atoms in the alkyl group fromwhich residue M may be derived include, but are not limited to, methylmethacrylate, ethyl methacrylate, propyl methacrylate, isopropylmethacrylate, butyl methacrylate, isobutyl methacrylate, tert-butylmethacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, isobornylmethacrylate, cyclohexyl methacrylate, 3,3,5-trimethylcyclohexylmethacrylate, as well as functional methacrylates, such as hydroxyalkylmethacrylates, oxirane functional methacrylates, and carboxylic acidfunctional methacrylates.

Residue M may also be selected from monomers having more than onemethacrylate group, for example, methacrylic anhydride anddiethyleneglycol bis(methacrylate).

As used herein and in the claims, by “allylic monomer(s)” what is meantis monomers containing substituted and/or unsubstituted allylicfunctionality, i.e., one or more radicals represented by the followinggeneral formula VIII,H2C═C(R¹⁰)—CH₂—  (VIII)where R¹⁰ is hydrogen, halogen, or a C₁ to C₄ alkyl group. Mostcommonly, R¹⁰ is hydrogen or methyl and, consequently, general formulaVII represents the unsubstituted (meth)allyl radical, which encompassesboth allyl and methallyl radicals. Examples of allylic monomers include,but are not limited to, (meth)allyl alcohol (meth)allyl ethers, such asmethyl (meth)allyl ether; allyl esters of carboxylic acids, such as(meth)allyl acetate, (meth)allyl butyrate, (meth)allyl3,4-dimethoxybenzoate, and (meth)allyl benzoate.

The present copolymer composition is prepared by a method including thesteps of (a) providing a donor monomer composition comprising one ormore donor monomers of structure I; (b) mixing an ethylenicallyunsaturated monomer composition comprising one or more acceptor monomerswith (a) to form a total monomer composition substantially free ofmaleate- and fumarate-type monomers; and (c) polymerizing the totalmonomer composition in the presence of a free radical initiator in thesubstantial absence of transition metals and Lewis acids. In anembodiment of the present invention, the ethylenically unsaturatedmonomer composition includes monomers of structure III.

In an embodiment of the present method, the monomer of structure I ispresent at a molar excess based on the amount of acrylic acceptormonomer. Any amount of excess monomer of structure may be used in thepresent invention in order to encourage the formation of the desiredalternating architecture. The excess amount of monomer of structure Imay be at least 10 mol %, in some cases up to 25 mol %, typically up to50 mol %, and, in some cases, up to 100 mol %, based on the amount ofacrylic acceptor monomer. When the molar excess of monomer of structureI is too high, the process may not be economical on a commercial scale.

In a further embodiment of the present method, the acrylic acceptormonomer is present in an amount of at least 15 mol %, in some cases 17.5mol %, typically at least 20 mol %, and, in some cases, 25 mol % of thetotal monomer composition. The acrylic acceptor monomer may further bepresent in an amount up to 50 mol %, in some cases up to 47.5 mol %,typically up to 45 mol %, and, in some cases, up to 40 mol % of thetotal monomer composition. The level of the acrylic acceptor monomersused is determined by the properties that are to be incorporated intothe copolymer composition. The acrylic acceptor monomers may be presentin the monomer composition in any range of values inclusive of thosestated above.

The ethylenically unsaturated monomer composition of the present methodmay include other donor monomers as, described above, as well as othermonomers designated by M and described above. The use of other mildacceptor monomers is optional in the present method. When other mildacceptor monomers are present, they are present at a level of at least0.01 mol % of the copolymer composition, often at least 0.1 mol %,typically at least mol %, and, in some cases, at least 2 mol %, of thetotal monomer composition. The other acceptor monomers may be present atup to 35 mol %, in some cases up to 25 mol %, typically up to 15 mol %,and, in some cases, up to 10 mol % of the total monomer composition. Thelevel of other acceptor monomers used herein is determined by theproperties that are to be incorporated into the copolymer compositionResidues from the other acceptor monomers may be present in thecopolymer composition in any range of values inclusive of those statedabove.

The use of other monomers, M, is optional in the present method. Whenother monomers are present, they are present at a level of at least 0.01mol % of the copolymer composition, often at least 0.1 mol %, typicallyat least 1 mol %, and, in some cases, at least 2 mol %. The othermonomers may be present at up to 35 mol %, in some cases up to 25 mol %,typically up to 15 mol %, and, in some cases, up to 10 mol %. The levelof other monomers used herein is determined by the properties that areto be incorporated into the copolymer composition. Residues from theother monomers, M, may be present in the copolymer composition in anyrange of values inclusive of those stated above.

In an embodiment of the present method, an excess of monomer ofstructure I is used and the unreacted monomer of structure I is removedfrom the resulting copolymer, composition by evaporation. The removal ofunreacted monomer is typically facilitated by the application of avacuum to the reaction vessel.

Any suitable free radical initiator may be used in the presentinvention. Examples of suitable free radical initiators include, but arenot limited to thermal free radical initiators, photo-initiators, andredox initiators. Examples of suitable thermal free radical initiatorsinclude, but are not limited to, peroxide compounds, azo compounds, andpersulfate compounds.

Examples of suitable peroxide compound initiators include, but are notlimited to, hydrogen peroxide, methyl ethyl ketone peroxides, benzoylperoxides, di-t-butyl peroxide, di-t-amyl peroxide, dicumyl peroxide,diacyl peroxides, decanoyl peroxides, lauroyl peroxides,peroxydicarbonates, peroxyesters, dialkyl peroxides, hydroperoxides,peroxyketals, and mixtures thereof.

Examples of suitable azo compounds include, but are not limited to,4-4′-azobis(4-cyanovaleric acid), 1-1′-azobiscyclohexanecarbonitrile),2-2′-azobisisobutyronitrile, 2-2′-azobis(2-methylpropionamidine)dihydrochloride 2-2′-azobis(2-methylbutyronitrile),2-2′-azobis(propionitrile), 2-2′-azobis(2,4-dimethylvaleronitrile),2-2′-azobis(valeronitrile),2,2′-azobis[2-methyl-N-(2-hydroxyethyl)propionamide],4,4′-azobis(4-cyanopentanoic acid),2,2′-azobis(N,N′-dimethyleneisobutyramidine),2,2′azobis(2-amidinopropane) dihydrochloride,2,2′-azobis(N,N′dimethyleneisobutyramidine) dihydrochloride, and2-(carbamoylazo)-isobutyronitrile.

In an embodiment of the present invention, the ethylenically unsaturatedmonomer composition and the free radical polymerization initiator areseparately and simultaneously added to and mixed with the donor monomercomposition. The ethylenically unsaturated monomer composition and thefree radical polymerization initiator may be added to the donor monomercomposition over a period of at least 15 minutes, in some cases at least20 minutes, typically at least 30 minutes, and, in some cases, at least1 hour. The ethylenically unsaturated monomer composition and the freeradical polymerization initiator may further be added to the donormonomer composition over a period of up to 24 hours, in some case up to18 hours, typically up to 12 hours, and, in some cases, up to 8 hours.The time for adding the ethylenically unsaturated monomer must besufficient to maintain a suitable excess of donor monomer of structure Iover unreacted acrylic acceptor monomer to encourage the formation ofdonor monomer—acceptor monomer alternating segments. The addition timeis not so long as to render the process economically unfeasible on acommercial scale. The addition time may vary in any range of valuesinclusive of those stated above.

After mixing or during addition and mixing, polymerization of themonomers takes place. The present polymerization method can be run atany suitable temperature. Suitable temperature for the present methodmay be ambient, at least 50° C., in many cases at least 60° C.,typically at least 75° C., and, in some cases, at least 100° C. Suitabletemperature for the present method may further be described as being upto 300° C., in many cases up to 275° C., typically up to 250° C., and,in some cases, up to 225° C. The temperature is typically high enough toencourage good reactivity from the monomers and initiators employed.However, the volatility of the monomers and corresponding partialpressures create a practical upper limit on temperature determined bythe pressure rating of the reaction vessel. The polymerizationtemperature may vary in any range of values inclusive of those statedabove.

The present polymerization method can be run at any suitable pressure. Asuitable pressure for the present method may be ambient, at least 1 psi,in many cases at least 5 psi, typically at least 15 psi, and, in somecases, at least 20 psi. Suitable pressures for the present method mayfurther be described as being up to 200 psi, in many cases up to 175psi, typically up to 150 psi, and, in some cases, up to 125 psi. Thepressure is typically high enough to maintain the monomers andinitiators in a liquid phase. The pressures employed have a practicalupper limit based on the pressure rating of the reaction vesselemployed. The pressure during polymerization temperature may vary in anyrange of values inclusive of those stated above.

The copolymer that results from the present method may be utilized as astarting material for the preparation of other polymers by usingfunctional group transformations by methods known in the art. Functionalgroups that can be introduced by these methods are epoxy, carboxylicacid, hydroxy, amide, oxazoline, acetoacetate, isocyanate, carbamate,amine, amine salt, quaternary ammonium, thioether, sulfide, sulfoniumand phosphate.

For example, a copolymer of the present method comprising methylacrylate will contain carbomethoxy groups. The carbomethoxy groups canbe hydrolyzed to carboxyl groups or transesterified with an alcohol toform the corresponding ester of the alcohol. Using ammonia, theaforementioned methyl acrylate copolymer can be converted to an amide,or, using a primary or secondary amine, can be converted to thecorresponding N-substituted amide. Similarly, using a diamine such asethylene diamine, one can convert the aforementioned copolymer of thepresent method to an N-aminoethylamide, or, with ethanolamine, to anN-hydroxyethylamide. The N-aminoethylamide functionality can be furtherconverted to an oxazoline by dehydration. The N-aminoethylamide can befurther reacted with a carbonate such as propylene carbonate to producethe corresponding urethane functional copolymer. These transformationscan be carried out to convert all of the carbomethoxy groups or can becarried out in part, leaving some of the carbomethoxy groups intact.

Epoxy groups can be introduced into the copolymer of the present methoddirectly by using glycidyl acrylate in the copolymer preparation orindirectly by functional group transformation. One example of anindirect method is to oxidize residual unsaturation in the copolymer toepoxy groups using a peracid such as peroxyacetic acid. Alternativelyone can prepare a carboxyl-functional copolymer by hydrolysis asdescribed above, treat the carboxyl-functional copolymer withepichlorohydrin then alkali to produce the epoxy functional copolymer.These transformations can also be carried out exhaustively or in part.The resulting epoxy-functional copolymer can be further reacted with theappropriate active hydrogen containing reagents to form alcohols, aminesor sulfides.

Hydroxyl groups can be introduced directly using a hydroxyl-functionalmonomer such as hydroxyethyl acrylate in the copolymer of the presentmethod, or they can be introduced by functional group transformation. Bytreating the carboxyl-functional copolymer described above with an epoxyone can produce a hydroxyl functional polymer. Suitable epoxies include,but are not limited to, ethylene oxide, propylene oxide, butylene oxideand glycidyl neodecanoate.

The above-described hydroxyl functional copolymers can be furtherreacted to form other copolymers. For example, a copolymer containinghydroxyethyly groups can be treated with, a carbamylating agent, such asmethyl carbamate, to produce the corresponding carbamate functionalcopolymer. With diketene or t-butyl acetoacetate the hydroxyl groups canalso be converted to acetoacetate esters.

Iscyanate functional copolymers can also be produced. Copolymers of thepresent method which contain 2 or more hydroxyl groups, can be treatedwith a diisocyariate such as isophoronediisocyanate to produceisocyanate-functional polymers. Primary amine functional copolymers,described, above, can be phosgenated to produce isocyanatefunctionality.

Ionic functionality can be incorporated into the copolymer of thepresent method by any means known in the art. Carboxylate groups can beintroduced by hydrolysis of ester groups in the copolymer followed byreaction with base. Amine salts can be introduced by preparing thepresent copolymer with an amine functional acrylate, such asdimethylaminoethyl acrylate, followed by protonation of the amino groupswith an acid. Amine salts can also be introduced by reacting a glycidylfunctional copolymer with ammonia or an active hydrogen containing aminefollowed by protonation with acid. Quaternary amine functional groups orternary sulfonium groups can be introduced into the copolymer bytreating an epoxy functional copolymer of the present method with atertiary amine or sulfide, respectively, in the presence of a proticacid.

A particular embodiment of the present invention is directed to a liquidthermosetting composition that includes an ungelled copolymercomposition, that is the copolymer composition containing a functionalgroup-containing copolymer of the present invention and a crosslinkingagent having at least two functional groups that are reactive with thefunctional groups of the copolymer.

In the liquid thermosetting composition, the functional groups in thecopolymer are any suitable functional groups. Suitable functional groupsinclude, but are not limited to, epoxy or oxirane, carboxylic acid,hydroxy, amide, oxazoline, aceto acetate, isocyanate, methylol, methylolether, and carbamate. The crosslinking agent will have suitablefunctional groups that will react with the functional groups in thecopolymer. Suitable functional groups for the crosslinking agentinclude, but are not limited to, epoxy or oxirane, carboxylic acid,hydroxy, polyol, isocyanate, capped isocyanate, amine, methylol,methylol ether, aminoplast and beta-hydroxyalkylamide.

The functional copolymer will typically have a functional equivalentweight of from 100 to 5,000 grams/equivalent. The equivalent ratio offunctional groups of the crosslinking agent to functional equivalents inthe functional copolymer is typically within the range of 1:3 to 3:1.The crosslinking agent is present in the liquid thermosettingcomposition in an amount of from 1 to 45 percent by weight, based ontotal weight of resin solids, and the functional copolymer is present inan amount of from 55 to 99 percent by weight, based on total weight ofresin solids.

A non-limiting example of the present liquid thermosetting compositionis one where the functional group of the copolymer is hydroxy and thefunctional group of the crosslinking agent is a capped polyisocyanate,where the capping group of the capped polyisocyanate crosslinking agentis one or more of hydroxy functional compounds, 1H-azoles, lactams,ketoximes, and mixtures thereof. The capping group may be phenol,p-hydroxy methylbenzoate, 1H-1,2,4-triazole, 1H-2,5-dimethylpyrazole,2-propanone oxime, 2-butanone oxime, cyclohexanone oxime, ecaprolactam,or mixtures thereof. The polyisocyanate of the capped polyisocyanatecrosslinking agent is one or more of 1,6-hexamethylene diisocyanate,cyclohexane diisocyanate, α,α′-xylylene diisocyanate,α,α,α′,α′-tetramethylxylylene diisocyanate,1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane,diisocyanatodicyclohexylmethane, dimers of the polyisocyanates, ortrimers of the polyisocyanates.

When the copolymer has hydroxy functionality, it will typically have ahydroxy equivalent weight of from 100 to 10,000 grams/equivalent. Theequivalent ratio of isocyanate equivalents in the capped polyisocyanatecrosslinking agent to hydroxy equivalents in the hydroxy functionalcopolymer is typically within the range of 1:3 to 3:1. In thisembodiment, the capped polyisocyanate crosslinking agent is present inthe liquid thermosetting composition in an amount of from 1 to 45percent by weight, based on total weight of resin solids, and thehydroxy functional copolymer is present in an amount of from 55 to 99percent by weight, based on total weight of resin solids.

Another non-limiting example of the present liquid thermosettingcomposition is one where the copolymer has epoxy functional groups andthe crosslinking agent is a carboxylic acid functional compound havingfrom 4 to 20 carbon atoms. The carboxylic acid crosslinking agent may beone or more of dodecanedioic acid, azelaic acid, adipic acid,1,6-hexanedioic acid, succinic acid, pimelic acid, sebacic acid, maleicacid, citric acid, itaconic acid, or aconitic acid.

A further non-limiting example of the present liquid thermosettingcomposition is one where the copolymer has carboxylic acid functionalgroups and the crosslinking agent is a beta-hydroxyalkylamide compound.The liquid thermosetting composition may further include a secondpolycarboxylic acid functional material selected from the groupconsisting of C₄ to C₂₀ aliphatic carboxylic acids, polymericpolyanhydrides, polyesters, polyurethanes and mixtures thereof. Thebeta-hydroxyalkylamide may be represented by the following structure IX:

-   -   where R²⁴ is H or C₁–C₅ alkyl; R²⁵ is H, C₁–C₅ alkyl structure        X:

for which R²⁴ is as described above, E is a chemical bond or monovalentor polyvalent organic radical derived from saturated, unsaturated, oraromatic hydrocarbon radicals including substituted hydrocarbon radicalscontaining from 2 to 20 carbon atoms, m is 1 or 2, n is from 0 to 2, andm+n is at least 2.

The liquid thermosetting composition of the present invention ispreferably used as a film-forming (coating) composition and may containadjunct ingredients conventionally used in such compositions. Optionalingredients such as, for example, plasticizers, surfactants, thixotropicagents, anti-gassing agents, organic cosolvents, flow controllers,anti-oxidants, UV light absorbers, and similar additives conventional inthe art may be included in the composition. These ingredients aretypically present at up to about 40% by weight based on the total weightof resin solids.

The liquid thermosetting composition of the present invention may bewaterborne, but is usually solventborne. Suitable solvent carriersinclude the various esters, ethers, and aromatic solvents, includingmixtures thereof, that are known in the art of coating formulation. Thecomposition typically has a total solids content of about 40 to about 80percent by weight. The liquid thermosetting compositions of the presentinvention will often have a VOC content of less than 4 percent byweight, typically less than 3.5 percent by weight and many times lessthan 3 percent by weight.

The liquid thermosetting composition of the present invention maycontain color pigments conventionally used in surface coatings and maybe used as a monocoat; that is, a pigmented coating. Suitable colorpigments include, for example, inorganic pigments such as titaniumdioxide, iron oxides, chromium oxide, lead chromate, and carbon black,and organic pigments such as phthalocyanine blue and phthalocyaninegreen. Mixtures of the above mentioned pigments may also be used.Suitable metallic pigments include, in particular, aluminum flake,copper bronze flake, and metal oxide coated mica, nickel flakes, tinflakes, and mixtures thereof.

In general, the pigment is incorporated into the coating composition inamounts up to about 80 percent by weight based on the total weight ofcoating solids. The metallic pigment is employed in amounts of about 0.5to about 25 percent by weight based on the total weight of coatingsolids.

In another embodiment, the present thermosetting composition is aco-reactable solid, particulate mixture, or powder of a reactant havingat least two functional groups and the present functionalgroup-containing copolymer composition. In the powder thermosettingcomposition, the reactant may have functional groups selected from epoxyor oxirane, carboxylic acid, hydroxy, polyol, isocyanate, cappedisocyanate, amine, aminoplast, methylol, methylol ether, andbeta-hydroxyalkylamide. The functional groups of the copolymer may beone or more of epoxy or oxirane, carboxylic acid, hydroxy, amide,oxazoline, aceto acetate, isocyanate, methylol, methylol ether, andcarbamate. The functional groups of the reactant will react with thefunctional groups in the copolymer.

The functional copolymer typically has a functional group equivalentweight of from 100 to 5,000 grams/equivalent and the equivalent ratio ofreactant functional groups to functional copolymer functional groups iswithin the range of 1:3 to 3:1. Typically the reactant is present in anamount of from 1 to 45 percent by weight, based on total weight of resinsolids, and the functional copolymer is present in an amount of from 55to 99 percent by weight, based on total weight of resin solids.

In an embodiment of the present powder thermosetting composition thefunctional groups of the copolymer are hydroxy functional groups and thereactant is a capped polyisocyanate crosslinking agent. In thisembodiment, the capping group of the capped polyisocyanate crosslinkingagent is one or more of hydroxy functional compounds, 1H-azoles,lactams, and ketoximes. The capping group is one or more of phenol,p-hydroxy methylbenzoate, 1H-1,2,4-triazole, 1H-2,5-dimethylpyrazble,2-propanone oxime, 2-butanone oxime; cyclohexanone oxime, ande-caprolactam. The polyisocyanate of the capped polyisocyanatecrosslinking agent is one or more of 1,6-hexamethylene diisocyanate,cyclohexane diisocyanate, α,α′-xylylene diisocyanate,α,α′,α′,α′-tetramethylxylylene diisocyanate,1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane,2,4,4-trimethyl hexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, diisocyanato-dicyclohexylmethane, dimers ofsaid polyisocyanates, and trimers of the polyisocyanates.

The hydroxy functional copolymer typically has a hydroxy equivalentweight of from 100 to 10,000 grams/equivalent and the equivalent ratioof isocyanate equivalents in the capped polyisocyanate crosslinkingagent to hydroxy equivalents in the hydroxy functional copolymer iswithin the range of 1:3 to 3:1. Typically, the capped polyisocyanatecrosslinking agent is present in an amount of from 1 to 45 percent byweight, based on total weight of resin solids, and the hydroxyfunctional copolymer is present in an amount of from 55 to 99 percent byweight, based on total weight of resin solids.

In another embodiment of the powder thermosetting composition, thefunctional groups of the copolymer are epoxy functional groups and thereactant is a carboxylic functional reactant having from 4 to 20 carbonatoms. The carboxylic acid reactant is typically one or more ofdodecanedioic acid, azelaic acid, adipic acid, 1,6-hexanedioic acid,succinic acid, pimelic acid, sebacic acid, maleic acid, citric acid,itaconic acid, and aconitic acid.

In a further embodiment of the powder thermosetting composition, thefunctional groups of the copolymer are carboxylic functional groups andthe reactant is a beta-hydroxyalkylamide. In this embodiment, the powderthermosetting composition may further include a second polycarboxylicacid, typically one or more of C₄ to C₂₀ aliphatic carboxylic acids,polymeric polyanhydrides, polyesters, polyurethanes, and mixturesthereof. The beta-hydroxyalkylamide is typically one represented bystructure IX as detailed above.

The powder thermosetting composition of the present invention may alsoinclude one or more cure catalysts for catalyzing the reaction betweenthe crosslinking agent and the functional copolymer. Classes of usefulcatalysts include metal compounds, in particular, organic tin compounds,and tertiary amines. Examples of organic tin compounds include, but arenot limited to, tin(II) salts of carboxylic acids, e.g., tin(II)acetate, tin(II) octanoate, tin(II) ethylhexanoate and tin(II) laurate;tin(IV) compounds, e.g., dibutyltin oxide, dibutyltin dichloride,dibutyltin diacetate, dibutyltin dilaurate, dibutyltin maleate, anddioctyltin diacetate. Examples of suitable tertiary amine catalystsinclude, but are not limited to, diazabicyclo[2.2.2]octane and1,5-diazabicyclo[4,3,0]non-5-ene. Preferred catalysts include tin(II)octanoate and dibutyltin(IV) dilaurate.

The powder thermosetting composition of the present invention may alsoinclude pigments and fillers. Examples of pigments include, but are notlimited to, inorganic pigments, e.g., titanium dioxide and iron oxides,organic pigments, e.g., phthalocyanines, anthraquinones, quinacridonesand thioindigos, and carbon blacks. Examples of fillers include, but arenot limited to, silica, e.g., precipitated silicas, clay, and bariumsulfate. When used in the composition of the present invention, pigmentsand fillers are typically present in amounts of from 0.1 percent to 70percent by weight, based on total weight of the thermosettingcomposition. More often, the thermosetting composition of the presentinvention is used as a clear composition being substantially free ofpigments and fillers.

The powder thermosetting composition of the present invention mayoptionally contain additives such as waxes for flow and wetting, flowcontrol agents, e.g., poly(2-ethylhexyl)acrylate, degassing additivessuch as benzoin, adjuvant resin to modify and optimize coatingproperties, antioxidants and ultraviolet (UV) light absorbers. Examplesof useful antioxidants and UV light absorbers include those availablecommercially from Ciba-Geigy under the trademarks IRGANOX and TINUVIN.These optional additives, when used, are typically present in amounts upto 20 percent by weight, based on total weight of the thermosettingcomposition.

The powder thermosetting composition of the present invention istypically prepared by first dry blending the hydroxy functional polymer,the crosslinking agent and additives, such as flow control agents,degassing agents and catalysts, in a blender, e.g., a Henshel bladeblender. The blender is operated for a period of time sufficient toresult in a homogenous dry blend of the materials charged thereto. Thehomogenous dry blend is then melt blended in an extruder, e.g., a twinscrew co-rotating extruder, operated within a temperature range of 80°C. to 140° C., e.g., from 100° C. to 125° C. The extrudate of thethermosetting composition of the present invention is cooled and, whenused as a powder coating composition, is typically milled to an averageparticle size of from, for example, 15 to 30 microns.

In a particular embodiment of the present invention, the thermosettingcomposition is a thermosetting composition that includes a resinousphase dispersed in an aqueous medium. The resinous phase includes anungelled copolymer composition that includes the copolymer compositiondescribed above having a functional group containing one or more activehydrogen groups and a suitable ionic group; and a curing agent having atleast two functional groups that are reactive with the active hydrogengroups of the copolymer. Suitable ionic groups include anionic groupsand cationic groups. A non-limiting example of a suitable cationic groupis an onium salt group. The active hydrogen group-containing copolymertypically has a number average molecular weight in the range of from1,000 to 30,000.

The functional copolymer has an equivalent weight of from 100 to 5,000grams/equivalent and the equivalent ratio of functional groups in thecuring agent to equivalents in the functional copolymer is within therange of 1:3 to 3:1. The curing agent is present in an amount of from 1to 45 percent by weight, based on total weight of resin solids, and thefunctional copolymer is present in an amount of from 55 to 99 percent byweight, based on total weight of resin solids.

The thermosetting composition is in the form of an aqueous dispersion.The term “dispersion” is believed to be a two-phase transparent,translucent, or opaque resinous system in which the resin is in thedispersed phase and the water is in the continuous phase. The averageparticle size of the resinous phase is generally less than 1.0 andusually less than 0.5 microns, preferably less than 0.15 micron.

The concentration of the resinous phase in the aqueous medium is atleast 1 and usually from about 2 to about 60 percent by weight based ohtotal weight of the aqueous dispersion. When the compositions of thepresent invention are in the form of resin concentrates, they generallyhave a resin solids content of about 20 to about 60 percent by weightbased on weight of the aqueous dispersion.

The active hydrogen groups of the copolymer are typically provided byresidues of one or more of the monomers hydroxyethyl acrylate,hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropylmethacrylate, acrylic acid, methacrylic acid, acrylamide, methacrylamide2-carbamoyloxyethyl acrylate, 2-carbamoyloxyethyl methacrylate,2-carbamoyloxypropryl acrylate and 2-carbamyloyloxypropryl methacrylate.More specifically, the active hydrogen groups in the copolymer may beone or more of carboxylic acid, hydroxy, amide, and carbamate; andfunctional groups of the curing agent are different than those in thecopolymer and are one or more of epoxy or oxirane, carboxylic acid,hydroxy, polyol, isocyanate, capped isocyanate, amine, aminoplast, andbeta-hydroxyalkylamide.

The onium salt functional monomers are typically one or more ofquaternary ammonium salts and ternary sulfonium salts. Non-limitingexamples of onium salt functional monomers, residues of which may beincluded in the present functional copolymer include an epoxygroup-containing ethylenically unsaturated monomer which afterpolymerization has been post-reacted with an amine acid salt, an amineacid salt of dimethyl aminoethyl acrylate, or dimethyl aminoethylmethacrylate and at least one epoxy group-containing monomer which afterpolymerization has been post-reacted with a sulfide in the presence ofan acid. The curing agent is present in an amount of from 1 to 75, insome cases 1 to 45, and typically 1 to 25 percent by weight, based ontotal weight, of resin solids, and the functional copolymer is presentin an amount of from 25 to 99, in some cases 55 to 99, and typically 75to 99 percent by weight, based on total weight of resin solids.

The thermosetting composition is in the form of an aqueous dispersion ofthe invention and typically in the form of electrodeposition baths whichare usually supplied as two components: (1) a clear resin feed, whichincludes generally the active hydrogen-containing polymer which containsonium salt groups, i.e., the main film-forming polymer, the curingagent, and any additional water-dispersible, non-pigmented components;and (2) a pigment paste, which generally includes one or more pigments,a water-dispersible grind resin which can be the same or different fromthe main-film forming polymer, and, optionally, additives such aswetting or dispersing aids. Electrodeposition bath components (1) and(2) are dispersed in an aqueous medium which comprises water and,usually, coalescing solvents. Alternatively, the electrodeposition bathmay be supplied as a one-component system which contains the mainfilm-forming polymer, the curing agent, the pigment paste, and anyoptional additives in one package. The one-component system is dispersedin an aqueous medium as described above.

The electrodeposition bath of the present invention has a resin solidscontent usually within the range of about 5 to 25 percent by weightbased on total weight of the electrodeposition bath.

In addition to water, the aqueous medium may contain a coalescingsolvent. Useful coalescing solvents include hydrocarbons, alcohols,esters, ethers, and ketones. The preferred coalescing solvents includealcohols, polyols, and ketones. Specific coalescing solvents includeisopropanol, butanol, 2-ethylhexanol, isophorone, 2-methoxypentanone,ethylene, and propylene glycol and the monoethyl, monobutyl, andmonohexyl ethers of ethylene or propylene glycol. The amount ofcoalescing solvent is generally between about 0.01 and 25 percent and,when used, preferably from about 0.05 to about 5 percent by weight basedon total weight of the aqueous medium.

A pigment composition and, if desired, various additives, such assurfactants, wetting agents, or catalyst, can be included in thedispersion. The pigment composition may be of the conventional typecomprising pigments, for example, iron oxides, strontium chromate,carbon black, coal dust, titanium dioxide, talc, barium sulfate, as wellas color pigments, such as cadmium yellow, cadmium red, chromium yellow,and the like. The pigment content of the dispersion is usually expressedas a pigment-to-resin ratio. In the practice of the invention, whenpigment is employed, the pigment-to-resin ratio is usually within therange of about 0.02 to 1:1. The other additives mentioned above areusually in the dispersion in amounts of about 0.01 to 3 percent byweight based on weight of resin solids.

In an embodiment of the resinous phase dispersed in an aqueous medium,the active hydrogen functional groups of copolymer are hydroxy and thefunctional groups of the curing agent are a capped polyisocyanate. Thecapping group of the capped polyisocyanate crosslinking agent is one ormore of hydroxy functional compounds, 1H-azoles, lactams, and ketoximes.The capping group is one or more of phenol, p-hydroxy methylbenzoate,1H-1,2,4-triazole, 1H-2,5-dimethyl pyrazole, 2-propanone oxime,2-butanone oxime, cyclohexanone oxime, and e-caprolactam. Thepolyisocyanate of the capped polyisocyanate curing agent is one or moreof of 1,6-hexamethylene diisocyanate, cyclohexane diisocyanate,α,α′-xylylene diisocyanate, α,α,α′,α′-tetramethylxylylene diisocyanate,1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane,diisocyanato-dicyclohexylmethane, dimers of said polyisocyanates, andtrimers of the polyisocyanates.

In a particular embodiment of the thermosetting composition having aresinous phase dispersed in an aqueous medium, the functional groups ofcopolymer are carboxylic acid functional groups and the curing agent isa beta-hydroxyalkylamide compound. The thermosetting composition mayfurther include a second polycarboxylic acid functional material, whichmay be one or more of C₄ to C₂₀ aliphatic carboxylic acids, polymericpolyanhydrides, polyesters, and polyurethanes. Thebeta-hydroxyalkylamide is typically one represented by structure VIII asdetailed above.

In a specific embodiment of the thermosetting composition having aresinous phase dispersed in an aqueous medium, the copolymer is asubstantially linear polymer having a number average molecular weight inthe range of from 1,000 to 30,000. The copolymer includes residues froman onium salt functional monomer derived from at least one epoxygroup-containing monomer which, after polymerization, has beenpost-reacted with an amine acid salt, hydroxy alkyl acrylates, ormethacrylates having 1 to 4 carbon atoms in the alkyl group, at leastone acrylate acceptor monomer, and a monomer decribed by structure I.

The present invention is also directed to a method of coating asubstrate, which includes the steps of:

(A) applying a thermosetting composition to the substrate;

(B) coalescing the thermosetting composition to form a substantiallycontinuous film; and

(C) curing the thermosetting composition.

The thermosetting composition is typically the liquid thermosettingcomposition or powder thermosetting composition described above. Thethermosetting composition includes the copolymer composition of thepresent invention, which includes a functional copolymer as previouslydescribed and a crosslinking agent having at least two functional groupsthat are reactive with the functional groups of the functionalcopolymer.

The thermosetting compositions described above can be applied to varioussubstrates to which they adhere, including wood; metals such as ferroussubstrates and aluminum substrates; glass; plastic, plastic and sheetmolding compound based plastics.

The compositions can be applied by conventional means includingbrushing, dipping, flow coating, spraying, and the like, but they aremost often applied by spraying. The usual spray techniques and equipmentfor air spraying and electrostatic spraying and either manual orautomatic methods can be used. Substrates that may be coated by themethod of the present invention include, for example, wood, metal,glass, and plastic.

The thermosetting composition of the present invention may be applied tothe substrate by any appropriate means that are known to those ofordinary skill in the art. The thermosetting composition may be in theform of a dry powder or, alternatively, a liquid medium. When thesubstrate is electrically conductive, the thermosetting composition istypically electrostatically applied. Electrostatic spray applicationgenerally involves drawing the thermosetting composition from afluidized bed and propelling it through a corona field. The particles ofthe thermosetting composition become charged as they pass through thecorona field and are attracted to and deposited upon the electricallyconductive substrate, which is grounded. As the charged particles beginto build up, the substrate becomes insulated, thus limiting furtherparticle deposition. This insulating phenomenon typically limits thefilm build of the deposited composition to a maximum of 3 to 6 mils (75to 150 microns).

Alternatively, when the substrate is not electrically conductive, forexample as is the case with many plastic substrates, the substrate istypically preheated prior to application of the thermosettingcomposition. The preheated temperature of the substrate is equal to orgreater than that of the melting point of the thermosetting composition,but less than its cure temperature. With spray application overpreheated substrates, film builds of the thermosetting composition inexcess of 6 mils (150 microns) can be achieved, e.g., 10 to 20 mils (254to 508 microns).

When the thermosetting composition is a liquid, the composition isallowed to coalesce to form a substantially continuous film on thesubstrate. Typically, the film thickness will be about 0.01 to about 5mils (about 0.254 to about 127 microns), preferably about 0.1 to about 2mils (about 2.54 to about 50.8 microns) in thickness. The film is formedon the surface of the substrate by driving solvent, i.e., organicsolvent and/or water, out of the film by heating or by an air dryingperiod. Preferably, the heating, will only be for a short period oftime, sufficient to ensure that any subsequently applied coatings can beapplied to the film without dissolving the composition. Suitable dryingconditions will depend on the particular composition but, in general, adrying time of from about 1 to 5 minutes at a temperature of about68–250° F. (20–121° C.) will be adequate. More than one coat of thecomposition may be applied to develop the optimum appearance. Betweencoats, the previously applied coat may be flashed, that is, exposed toambient conditions for about 1 to 20 minutes.

After application to the substrate, the thermosetting composition isthen coalesced to form a substantially continuous film. Coalescing ofthe applied composition is generally achieved through the application ofheat at a temperature equal to or greater than that of the melting pointof the composition, but less than its cure temperature. In the case ofpreheated substrates, the application and coalescing steps can beachieved in essentially one step.

The coalesced thermosetting composition is next cured by the applicationof heat. As used herein and in the claims, by “cured” is meant a threedimensional crosslink network formed by covalent bond formation, e.g.,between the free isocyanate groups of, the crosslinking agent and thehydroxy groups of the polymer. The temperature at which thethermosetting composition of the present invention cures is variable anddepends in part on, the type and amount of catalyst used. Typically, thethermosetting composition has a cure temperature within the range of130° C. to 160° C., e.g., from 140° C. to 150° C.

In accordance with the present invention, there is further provided amulti-component site coating composition that includes a base coatdeposited from a pigmented film-forming composition; and a transparenttop coat applied over the base coat. Either the base coat or thetransparent top coat or both coats may include the liquid thermosettingcomposition or the powder thermosetting composition described above. Themulti-component composite coating composition as described herein iscommonly referred to as a color-plus-clear coating composition.

The pigmented film-forming composition from which the base coat isdeposited can be any of the compositions useful in coatingsapplications, particularly automotive applications in whichcolor-plus-clear coating compositions are extensively used. Pigmentedfilm-forming compositions conventionally comprise a resinous binder anda pigment to act as a colorant. Particularly useful resinous binders areacrylic polymers, polyesters including alkyds, polyurethanes, and thecopolymer composition of the present invention.

The resinous binders for the pigmented film-forming base coatcomposition can be organic solvent-based materials, such as thosedescribed in U.S. Pat. No. 4,220,679, note column 2 line 24 throughcolumn 4, line 40. Also, water-based coating compositions such as thosedescribed in U.S. Pat. Nos. 4,403,003, 4,147,679, and 5,071,904 can beused as the binder in the pigmented film-forming composition.

The pigmented film-forming base coat composition is colored and may alsocontain metallic pigments. Examples of suitable pigments can be found inU.S. Pat. Nos. 4,220,679, 4,403,003, 4,147,679, and 5,071,904.

Ingredients that may be optionally present in the pigmented film-formingbase coat composition are those which are well known in the art offormulating surface coatings and include surfactants, flow controlagents, thixotropic agents, fillers, anti-gassing agents, organicco-solvents, catalysts, and other customary auxiliaries. Examples ofthese optional materials and suitable amounts are described in theaforementioned U.S. Pat. Nos. 4,220,679, 4,403,003, 4,147,769, and5,071,904.

The pigmented film-forming base coat composition can be applied to thesubstrate by any of the conventional coating techniques, such asbrushing, spraying, dipping, or flowing, but are most often applied byspraying. The usual spray techniques and equipment for air spraying,airless spray, and electrostatic spraying employing either manual orautomatic methods can be used. The pigmented film-forming, compositionis applied in an amount sufficient to provide a base coat having a filmthickness typically of 0.1 to 5 mils (2.5 to 125 microns) and preferably0.1 to 2 mils (2.5 to 50 microns).

After deposition of the pigmented film-forming base coat compositiononto the substrate, and prior to application of the transparent topcoat, the base coat can be cured or alternatively dried. In drying thedeposited base coat, organic solvent and/or water is driven out of thebase coat film by heating or the passage of air over its surface.Suitable drying conditions will depend on the particular base coatcomposition used and on the ambient humidity in the case of certainwater-based compositions. In general, drying of the deposited base coatis performed over a period of from 1 to 15 minutes and at a temperatureof 21° C. to 93° C.

The transparent top coat is applied over the deposited base coat by anyof the methods by which coatings are known to be applied. In anembodiment of the present invention, the transparent top coat is appliedby electrostatic spray application as described previously herein. Whenthe transparent top coat is applied over a deposited base coat that hasbeen dried, the two coatings can be co-cured to form the multi componentcomposite coating composition of the present invention. Both the basecoat and top coat are heated together to conjointly cure the two layers.Typically, curing conditions of 130° C. to 160° C. for a period of 20 to30 minutes are employed. The transparent top coat typically has athickness within the range of 0.5 to 6 mils (13 to 150 microns), e.g.,from 1 to 3 mils (25 to 75 microns).

In an embodiment of the present invention, the present thermosettingcomposition having a resinous phase dispersed in an aqueous medium maybe an electrocoating composition used to electrocoat a conductivesubstrate. In such an instance, the present invention is directed to amethod of electrocoating a conductive substrate serving as a cathode inan electrical circuit comprising the cathode and an anode. The cathodeand anode are immersed in the aqueous electrocoating composition, and anelectric current is passed between the cathode and the anode to causedeposition of the electrocoating composition on the substrate as asubstantially continuous film. The aqueous electrocoating composition isthe resinous phase of the thermosetting composition having a resinousphase dispersed in an aqueous medium.

Further to this embodiment, the active hydrogen group-containingcopolymer containing an ionic group, such as an onium salt groups may bepresent in the thermosetting compositions of the invention as a resinousbinder (i.e., a film-forming polymer) or as an additive in combinationwith a separate resinous binder. When used as an additive, for example,as a reactive diluent, the active hydrogen group-containing polymer asdescribed herein typically has a high degree of functionality and acorrespondingly low equivalent weight. However, it should be appreciatedthat for other applications, the additive may have low functionality (itmay be monofunctional) and a correspondingly high equivalent weight.

The active hydrogen group-containing polymer containing ionic groups istypically present in the thermosetting compositions of the invention inan amount of at least 0.5 percent by weight (when used as an additive)and in an amount of at least 25 percent by weight (when used as aresinous binder), based on total weight of resin solids of thethermosetting composition. The active hydrogen group-containing polymersare also typically present in the thermosetting compositions in anamount of less than 95 percent by weight, and preferably in an amount ofless than 80 percent by weight, based on total weight of resin solids ofthe thermosetting composition. The active hydrogen group-containingpolymer may be present in the thermosetting compositions of theinvention in an amount ranging between any combination of these values,inclusive of the recited values.

The thermosetting compositions of the invention are typically in theform of electrodeposition baths which are usually supplied as twocomponents: (1) a clear resin feed, which includes generally the activehydrogen-containing polymer which contains onium salt groups, i.e., themain film-forming polymer, the curing agent, and any additionalwater-dispersible, non-pigmented components; and (2) a pigment paste,which generally includes one or more pigments, a water-dispersible grindresin which can be the same or different from the main-film formingpolymer, and, optionally, additives, such as wetting or dispersing aids.Electrodeposition bath components (1) and (2) are dispersed in anaqueous medium which comprises water and, usually, coalescing solvents.Alternatively, the electrodeposition bath may be supplied as aone-component system which contains the main film-forming polymer, thecuring agent, the pigment paste, and any optional additives in onepackage. The one-component system is dispersed in an aqueous medium asdescribed above.

The electrodeposition bath of the present invention has a resin solidscontent usually within the range of about 5 to 25 percent by weightbased on total weight of the electrodeposition bath.

As aforementioned, besides water, the aqueous medium may contain acoalescing solvent. Useful coalescing solvents include hydrocarbons,alcohols, esters, ethers, and ketones. The preferred coalescing solventsinclude alcohols, polyols and ketones. Specific coalescing solventsinclude isopropanol, butanol, 2-ethylhexanol, isophorone,2-methoxypentanone, ethylene, and propylene glycol and the monoethyl,monobutyl, and monohexyl ethers of ethylene or propylene glycol. Theamount of coalescing solvent is generally between about 0.01 and 25percent and, when used, preferably from about 0.05 to about 5 percent byweight based on total weight of the aqueous medium.

As discussed above, a pigment composition and, if desired, variousadditives, such as surfactants, wetting agents, or catalyst, can beincluded in the dispersion. The pigment composition may be of theconventional type comprising pigments, for example, iron oxides,strontium chromate, carbon black, coal dust, titanium dioxide, talc,barium sulfate, as well as color pigments, such as cadmium yellow,cadmium red, chromium yellow, and the like. The pigment content of thedispersion is usually expressed as a pigment-to-resin ratio. In thepractice of the invention, when pigment is employed, thepigment-to-resin ratio is usually within the range of about 0.02 to 1:1.The other additives mentioned above are usually in the dispersion inamounts of about 0.01 to 3 percent by weight based on weight of resinsolids.

The thermosetting compositions of the present invention can be appliedby electrodeposition to a variety of electroconductive substrates,especially metals, such as untreated steel, galvanized steel, aluminum,copper, magnesium, and conductive carbon-coated materials. The appliedvoltage for electrodeposition may be varied and can be, for example, aslow as 1 volt to as high as several thousand volts, but typicallybetween 50 and 500 volts. The current density is usually between 0.5ampere and 5 amperes per square foot and tends to decrease duringelectrodeposition indicating the formation of an insulating film.

After the coating has been applied by electrodeposition, it is curedusually by baking at elevated temperatures, such as about 90° to about260° C. for about 1 to about 40 minutes.

The present invention further provides a primed multi-componentcomposite coating composition that includes a primer coat applied byelectrodeposition; a base coat deposited from a pigmented film-formingcomposition; and optionally a transparent top coat applied over the basecoat. The electrodeposited primer may include an aqueous electrocoatingcomposition that includes a resinous phase including the presentthermosetting composition for electrodeposition described above. Thebase coat and/or the transparent top coat may include the liquidthermosetting composition or the powder thermosetting compositiondescribed above.

Typically, A primer coat is deposited via electrodeposition as describedabove and cured as described above. Subsequently, a pigmentedfilm-forming base coat composition is applied over the primer coatedsubstrate, and prior to application of a top coat. The base coat can becured or alternatively dried. In drying the deposited base coat, organicsolvent and/or water is driven out of the base coat film by heating orthe passage of air over its surface. Suitable drying conditions willdepend on the particular base coat composition used and on the ambienthumidity in the case of certain water-based compositions. In general,drying of the deposited base coat is performed over a period of from 1to 15 minutes and at a temperature of 21° C. to 93° C.

The top coat may be applied over the deposited base coat by any of themethods by which coatings are known to be applied. In an embodiment ofthe present invention, the top coat is applied by electrostatic sprayapplication as described previously herein. When the top coat is appliedover a deposited base coat that has been dried, the two coatings can beco-cured to form the primed multi-component composite coatingcomposition of the present invention. Both the base coat and top coatare heated together to conjointly cure the two layers. Typically, curingconditions of 130° C. to 160° C. for a period of 20 to 30 minutes areemployed. The transparent top coat typically has a thickness within therange of 0.5 to 6 mils (13 to 150 microns), e.g., from 1 to 3 mils (25to 75 microns).

The present invention is more particularly described in the followingexamples, which are intended to be illustrative only, since numerousmodifications and variations therein will be apparent to those skilledin the art. Unless otherwise specified, all parts and percentages are byweight.

The following abbreviations are used in the examples.

AA acrylic acid DGME diethylene glycol monobutyl ether DIBK diisobutylketone DIIB diisobutulyene DMEA dimethyl ethanolamine DMAEM dimethylaminoethyl methacrylate EA Ethyl Acrylate EGME ethylene glycol monobutylether EGMHE ethylene glycol monohexyl ether 2EHA 2-ethylhexyl acrylateHEA hydroxy ethyl acrylate HPA hydroxypropylacrylate IB Isobutylene MAKmethyl n-amyl ketone MMA methylmethacrylate MEPGA methyl ether propyleneglycol acetate NBMA n-butyl methacrylate NBA n-butyl acrylate Styrstyrene

EXAMPLE 1-A

Synthesis of alternating copolymer diisobutylene/methylmethacrylate-alt-hydroxypropyl acrylate/butyl acrylate. The ingredientsin Table 3 were used for the polymerization.

TABLE 3 Parts by weight Ingredients (grams) Charge 1 Diisobutylene337.00 Charge 2 t-Amylperoxy 33.70 (2-ethyl hexanoate) Charge 3 MethylMethacrylate 337.00 Hydroxypropyl Acrylate 112.30 Butyl Acrylate 337.00

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was 500′ rpm andthe reactor temperature was adjusted to 125° C. Charge 2 was added tothe reactor at an addition rate of 9.62 grams/hour over 3.5 hours.Fifteen minutes after Charge 2 was started, Charge 3 was added to thereactor at an addition rate of 262.10 grams/hour over 3 hours. Duringthe monomer addition the temperature was maintained at 125° C. at 40PSI. After the addition of Charge 2 and Charge 3 was complete, thereaction mixture was held for 2 hours. The reactor was then cooled to25° C., and vented. Gas chromatography (GC) analysis of the reactionmixture showed that all of the (meth)acrylate had reacted. The reactionmixture was transferred to a 3 L flask, and was vacuum-stripped at 130°C. The reaction mixture was cool to 80° C. and 200 grams of n-butylacetate was added. The solids of the resulting polymer solution wasdetermined to be 78.3% determined at 110° C. for one hour. The copolymerhad a number average molecular weight (M_(n)) of 1,200 andpolydispersity (M_(w)/M_(n)) of 2.0 (determined by gel permeationchromatography using polystyrene as a standard). A ¹³C NMR spectrum wasconsistent with a molar copolymer composition of 21.9% diisobutylene,11.1% hydroxypropyl acrylate, 33.5% methyl methacrylate, and 33.5% butylacrylate.

EXAMPLE 1-B

Synthesis of alternating copolymer diisobutylene-alt-hydroxypropylacrylate/butyl acrylate. The ingredients in Table 4 were used for thepolymerization in isopropanol solvent.

TABLE 4 Parts by weight Ingredients (grams) Charge 1 Diisobutylene 500Isopropanol 400 Charge 2 Di-t-amyl Peroxide 20 Isopropanol 100 Charge 3Hydroxypropyl Acrylate 250 Butyl Acrylate 250

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was pressurized with nitrogen to provide a 5 psigpad on the reactor. The agitation on the reactor was set at 500 rpm andthe reactor temperature was adjusted to 150° C. Charge 2 was added tothe reactor at an addition rate of 48 grams/hour over 2.5 hours. After15 minutes Charge 3 was added to reactor at an addition rate 250grams/hour over 2 hours. During the monomer addition the temperature wasmaintained at 150° C. and 100 PSI. After Charge 2 and Charge 3 were inthe reactor, the reaction mixture was held for 2 hours. The reactor wasthen cooled to 25° C., and vented. GC analysis of the reaction mixtureshowed that all acrylates were reacted. The reaction mixture wastransferred to a 2 L flask, and was vacuum-stripped at 130° C. Thesolids of the resulting polymer solution was determined to be 100%determined at 110° C. for one hour. The copolymer had M_(n=)850 andM_(w)/M_(n=)1.7. The ¹³C NMR spectrum was consistent with a molarcopolymer composition of 24.7% diisobutylene, 37.65% hydroxypropylacrylate, and 37.65% butyl acrylate.

EXAMPLE 1-C

Synthesis of alternating copolymer diisobutylene-alt-hydroxyethylacrylate/butyl acrylate. The ingredients in Table 5 were used for thepolymerization in isopropanol solvent.

TABLE 5 Parts by weight Ingredients (grams) Charge 1 Diisobutylene 500Isopropanol 400 Charge 2 Di-t-amyl Peroxide 20 Isopropanol 100 Charge 3Hydroxyethyl Acrylate 250 Butyl Acrylate 250

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen to provide a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge, 2 was addedto the reactor at an addition rate of 48 grams/hour over 2.5 hours.After 15 minutes Charge 3 was added to reactor at an addition rate of250 grams/hour over 2 hours. During the monomer addition the temperaturewas maintained at 150° C. and 100 PSI. After Charge 2 and Charge 3 werein the reactor, the reaction mixture was held for 2 hours. The reactorwas then cooled to 25° C., and vented. GC analysis of the reactionmixture showed that all acrylates were reacted. The reaction mixture wastransferred to a 2 L flask, and was vacuum-stripped at 130° C. Thesolids of the resulting polymer was determined to be 100% determined at110° C. for one hour. The copolymer had number average molecular weight,M_(n=)910 and polydispersity M_(w)/M_(n=)1.8 (determined by gelpermeation chromatography using polystyrene as a standard). The ¹³C NMRspectrum is consistent with copolymer composition 25% Diisobutylene,37.5% Hydroxyethyl acrylate, and 37.5% Butyl acrylate.

EXAMPLE 2-D

Synthesis of alternating copolymer diisobutylene-alt-hydroxypropylacrylate/butyl acrylate/acrylic acid. The ingredients in Table 6 wereused for the polymerization.

TABLE 6 Parts by weight Ingredients (grams) Charge 1 Diisobutylene1120.00 Charge 2 Di-t-amyl Peroxide 93.60 Charge 3 Acrylic acid 144.00Hydroxypropyl Acrylate 720.00 Butyl acrylate 1136.00

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at an addition rate of 37.4 grams/hour over 2.5 hours.After 15 minutes Charge 3 was added to reactor at an addition rate of1000 grams/hour over 2 hours. During the monomer addition thetemperature was maintained at 150° C. at 100 PSI. After Charge 2 andcharge 3 were in the reactor, the reaction mixture was held for 2 hours.The reactor was then cooled to 25° C., and vented. GC analysis of thereaction mixture show that all acrylates were reacted. The reactionmixture was transferred to a 5 L flask, and was vacuum-stripped at 130°C. The solids of the resulting polymer was dissolved in 500 grams ofbutyl carbitol (Union Carbide) and the final solids of the solution wasdetermined to be 80.73%, determined at 110° C. for one hour. Thecopolymer had M_(n=)2080 and M_(w)/M_(n=)2.7. The ¹³C NMR spectrum wasconsistent with a molar copolymer composition of 24% diisobutylene,27.36% hydroxypropyl acrylate, 43.17%, butyl acrylate, and 5.47% acrylicacid.

EXAMPLE 3-E

Synthesis of alternating copolymer diisobutylene-alt-hydroxyethylacrylate/butyl acrylate. The ingredients in Table 7 were used for thepolymerization.

TABLE 7 Parts by weight Ingredients (grams) Charge 1 Diisobutylene1000.00 Charge 2 Di-t-amyl Peroxide 85.80 Charge 3 Hydroxyethyl Acrylate714.20 Butyl Acrylate 1142.90

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at an addition rate of 34.5 grams/hour over 2.5 hours.After 15 minutes Charge 3 was added to reactor at the addition rate of928.6 grams/hour over 2 hours. During the monomer addition thetemperature was maintained at 150° C. at 70 PSI. After charge 2 andcharge 3 were in the reactor, the reaction mixture was held for 2 hours.The reactor was then cooled to 25° C., and vented. GC analysis ofreaction mixture showed that all acrylates were reacted. The reactionmixture was transferred to a 5 L flask, and was vacuum-stripped at 130°C. The final solids of the resulting polymer was determined to be 97.56%110° C. for one hour. The copolymer had M_(n=)1760 and M_(w)/M_(n=)2.4.The ¹³C NMR spectrum is consistent with a copolymer composition of24.43% diisobutylene, 29.06% hydroxyethyl acrylate, and 46.51% butylacrylate.

EXAMPLE 3-F

Synthesis of alternating copolymer diisobutylene-alt-hydroxypropylacrylate/butyl acrylate. The ingredients in Table 8 were used for thepolymerization.

TABLE 8 Parts by weight Ingredients (grams) Charge 1 Diisobutylene1359.20 Charge 2 Di-t-amyl Peroxide 116.60 Charge 3 HydroxypropylAcrylate 970.80 Butyl Acrylate 1553.40

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at an addition rate of 46.6 grams/hour over 2.5 hours.After 15 minutes Charge 3 was added to the reactor at an addition rateof 1262.7 grams/hour over 2 hours. During the monomer addition thetemperature was maintained at 150° C. and 100 PSI. After charge 2 andcharge 3 were in the reactor, the reaction mixture was held for 2 hours.The reactor was then cooled to 25° C., and vented. GC analysis of thereaction mixture showed that all acrylates were reacted. The reactionmixture was transferred to a 5 L flask, and was vacuum-stripped at 130°C. The final solids of the resulting polymer was determined to be 97.96%determined at 110° C. for one hour. The copolymer had M_(n=)1610 andM_(w)/M_(n=)2.2. The ¹³C NMR spectrum is consistent with a molarcopolymer composition of 23.15% diisobutylene, 29.56% hydroxypropylacrylate, and 47.29% butyl-acrylate.

EXAMPLE 3-G

Synthesis of alternating copolymer isobutylene-alt-hydroxypropylacrylate/butyl acrylate. The ingredients in Table 9 were used for thepolymerization:

TABLE 9 Parts by weight Ingredients (grams) Charge 1 Isobutylene 1000.00Charge 2 Di-t-amyl Peroxide 85.80 Charge 3 Hydroxypropyl Acrylate 714.20Butyl Acrylate 1142.90

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at an addition rate of 34.3 grams/hour over 2.5 hours.After 15 minutes Charge 3 was added to reactor at an addition rate of928.6 grams/hour over 2 hours. During the monomer addition thetemperature was maintained at 150° C. at 250 PSI. After charge 2 andcharge 3 were in the reactor, the reaction mixture was held for 2 hours.The reactor was then cooled to 25° C., and vented. GC analysis of thereaction mixture showed that all acrylates were reacted. The reactionmixture was transferred to a 5 L flask, and was vacuum-stripped at 130°C. The final solids of the resulting polymer was determined to be 89.97%(remainder toluene) at 110° C. for one hour. The copolymer hadM_(n)=2760 and M_(w)/M_(n=)2.7. The ¹³C NMR spectrum is consistent witha copolymer composition of 35% isobutylene, 25% hydroxypropyl acrylate,and 40% butyl acrylate.

EXAMPLE 3-H

Synthesis of alternating copolymer diisobutylene-alt-hydroxypropylacrylate/butyl acrylate. The ingredients in Table 10 were used for thepolymerization.

TABLE 10 Parts by weight Ingredients (grams) Charge 1 Toluene 500.00Charge 2 Di-t-amyl Peroxide 69.00 Charge 3 Hydroxypropyl Acrylate 690.00Butyl Acrylate 1150.00 Styrene 460.00

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at addition rate of 27.6 grams/hour over 2.5 hours. After15 minutes Charge 3 was added to reactor at an addition rate of 1150grams/hour over 3 hours. During the monomer addition the temperature wasmaintained at 150° C. at 80 PSI. After charge 2 and charge 3 were in thereactor, the reaction mixture was held for 2 hours. The reactor was thencooled to 25° C., and vented. GC analysis of the reaction mixture showedthat all acrylates and styrene were reacted. The reaction mixture wastransferred to a 5 L flask, and was vacuum-stripped at 130° C. The finalsolids of the resulting polymer was determined to be 83.02% determinedat 110° C. for one hour. The copolymer had M_(n)=5020 andM_(w)/M_(n=)2.5. The ¹³C NMR spectrum is consistent with a molarcopolymer composition of 20% Styrene, 30% Hydroxypropyl acrylate, and50% Butyl acrylate.

EXAMPLE 4-I

Synthesis of copolymer diisobutylene/hydroxypropyl acrylate/butylmethacrylate/styrene/acrylic acid/butyl acrylate. The ingredients inTable 11 were used for the polymerization:

TABLE 11 Parts by weight Ingredients (grams) Charge 1 Diisobutylene500.00 Isopropanol 400.00 Charge 2 Di-t-amyl Peroxide 30.00 Isopropanol100.00 Charge 3 Hydroxypropyl Acrylate 450.00 Butyl Methacrylate 200.00Styrene 100.00 Acrylic Acid 30.00 Butyl Acrylate 220.00

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set and thereactor temperature was adjusted to 150° C. Charge 2 was added to thereactor at addition rate of 52 grams/hour over 2.5 hours. After 15minutes Charge 3 was added to reactor at the addition rate 500grams/hour over 2 hours. During the monomer addition the temperature wasmaintained at 150° C. at 100 PSI. After charge 2 and charge 3 were inthe reactor, the reaction mixture was held for 2 hours. The reactor wasthen cooled to 25° C., and vented. GC analysis of the reaction mixtureshowed that all acrylates, methacrylates and styrene were reacted. Thereaction mixture was transferred to a 3 L flask, and was vacuum-strippedat 130° C. The final solids of the resulting polymer was determined byadding 200 grams of butyl acetate to the polymer mixture. The solidswere measured at 82.2% at 110° C. for one hour. The copolymer hadM_(n=)1560 and M_(w)/M_(n=)2.2. The ¹³C NMR spectrum is consistent witha molar copolymer composition of 20.4% Diisobutylene, 36.3%Hydroxypropyl acrylate, 16.1% Butyl methacrylate, 8.1% Styrene, 2.4%Acrylic acid, and 17.6% Butyl acrylate.

EXAMPLE 4-J

Synthesis of copolymer diisobutylene/hydroxypropyl acrylate/butylmethacrylate/styrene/butyl acrylate. The ingredients in Table 12 wereused for the polymerization:

TABLE 12 Parts by weight Ingredients (grams) Charge 1 Diisobutylene1000.00 Charge 2 Di-t-amyl Peroxide 90.00 Charge 3 HydroxypropylAcrylate 900.00 Butyl Methacrylate 400.00 Styrene 200.00 Butyl Acrylate500.00

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at an addition rate of 36 grams/hour over 2.5 hours.After 15 minutes Charge 3 was added to reactor at the addition rate 1000grams/hour over 2 hours. During the monomer addition the temperature wasmaintained at 150° C. at 100 PSI. After charge 2 and charge 3 were inthe reactor, the reaction mixture was held for 2 hours. The reactor wasthen cooled to 25° C., and vented. GC analysis of the reaction mixtureshowed that all acrylates, methacrylates and styrene were reacted. Thereaction mixture was transferred to 5 L flask, and was vacuum-strippedat 125° C. The final solids of the resulting polymer was determined tobe 98.63 at 110° C. for one hour. The copolymer had M_(n=)1960 andM_(w)/M_(n=)2.3. The ¹³C NMR spectrum is consistent with a molarcopolymer composition of 17.67% diisobutylene, 37.1% hydroxypropylacrylate, 16.36% butyl methacrylate, 8.25% styrene, and 20.62% butylacrylate.

EXAMPLE 4-K

Synthesis of copolymer diisobutylene/hydroxypropyl acrylate/butylmethacrylate/styrene/hydroxyethyl methacrylate/butyl acrylate. Theingredients in Table 13 were used for the polymerization.

TABLE 13 Parts by weight Ingredients (grams) Charge 1 Diisobutylene1000.00 Charge 2 Di-t-amyl Peroxide 90.00 Charge 3 HydroxypropylAcrylate 450.00 Butyl Methacrylate 400.00 Styrene 200.00 HydroxyethylMethacrylate 450.00 Butyl Acrylate 500.00 Charge 4 Xylene 250.00

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at an addition rate of 36 grams/hour over 2.5 hours.After 15 minutes Charge 3 was added to reactor at an addition rate of1000 grams/hour over 2 hours. During the monomer addition thetemperature was maintained at 15° C. at 100 PSI. After charge 2 andcharge 3 were in the reactor, the reaction mixture was held for 2 hours.The reactor was then cooled to 25° C., and vented. GC analysis of thereaction mixture showed that all acrylates, methacrylates and styrenewere reacted. The reaction mixture was transferred to a 5 L flask, andwas vacuum-stripped at 125° C. The final solids of the resulting polymerwas determined by adding 250 grams of xylene to the polymer mixture. Thesolids were 87.60% determined at 110° C. for one hour. The copolymer hadM_(n=)1930 and M_(w)/M_(n=)2.6. The ¹³C NMR spectrum is consistent witha molar copolymer composition of 15.6% diisobutylene, 18.99%hydroxypropyl acrylate, 16.88% butyl methacrylate, 8.44% styrene, 18.99%hydroxyethyl methacrylate and 21.10% butyl acrylate.

EXAMPLE 4-L

Synthesis of carbamate functional polymer fromdiisobutylene/hydroxypropyl acrylate/butyl methacrylate/styrene/butylacrylate (DIB/HPA/BMA/Sty/BA) copolymer from example 4-J. Acarbamate-functional copolymer was prepared from the ingredients inTable 14.

TABLE 14 Parts by weight Ingredients (grams) Charge 1Acrylic/Diisobutylene copolymer 1067.30 solution (Example 4-J) Xylene85.60 Aromatic 100 (ExxonMobil) 85.60 Methyl carbamate 169.00 Butylstannoic acid 2.23 Triphenyl phosphite 2.23

A suitable reactor was charged with the above ingredients and equippedwith a thermocouple, overhead stirrer, nitrogen inlet and a refluxcondenser. The mixture was heated to 144° C. under a nitrogen blanket.At this temperature, the reaction refluxed slightly. The reactionmixture was held for one hour at 145° C. After the hold period wascomplete, the reflux condenser was removed, and the reactor was equippedfor distillation (short column, distillation head, thermocouple, andreceiver flask) at atmospheric pressure. Distillate began to becollected at 145° C. The temperature of the reaction was graduallyincreased over a 6 hour period to 155° C. to maintain a steady rate ofdistillation. When distillation ceased and 64.5 ml of methanol had beencollected, the reaction mixture was sampled and the hydroxy value foundto be 46.5 at 85.88% solids. The contents of the reactor were thencooled.

EXAMPLE 4-M

Synthesis of carbamate functional polymer fromdiisobutylene/hydroxypropyl acrylate/butylmethacrylate/styrene/hyroxyethyl methacrylate/butyl acrylate(DIB/HPA/BMA/Sty/HEMA/BA) copolymer (example 4-K). Acarbamate-functional copolymer was prepared from the ingredients inTable 15.

TABLE 15 Parts by weight Ingredients (grams) Charge 1Acrylic/Diisobutylene copolymer 1172.90 solution (Example 4 -K) Methylcarbamate 169.00 Butyl stannoic acid 2.40 Triphenyl phosphite 2.40

A suitable reactor was charged with the above ingredients and equippedwith a thermocouple, overhead stirrer, nitrogen inlet and a refluxcondenser. The mixture was heated to 144° C. under a nitrogen blanket.At this temperature, the reaction refluxed slightly. The reactionmixture was held for one hour at 145° C. After the hold period wascomplete, the reflux condenser was removed, and the reactor was equippedfor distillation (short column, still head, thermocouple, and receiverflask) at atmospheric pressure. Distillate began to be collected at 145°C. The temperature of the reaction was gradually increased over to 6hours to 155° C. to maintain a steady rate of distillation. Whendistillation ceased and 65.6 ml methanol collected, the reaction mixturewas sampled and the hydroxy value found to be 59.1 at 88.55% solids. Thecontents of the reactor were then cooled.

EXAMPLE 5-N

Synthesis of copolymer isobutylene/dimethylaminoethylmethacrylate-alt-hydroxyethyl acrylate/2-ethylhexyl acrylate. Theingredients in Table 16 were used for the polymerization.

TABLE 16 Parts by weight Ingredients (grams) Charge 1 Isobutylene 500.00Charge 2 Di-t-amyl Peroxide 75.00 Charge 3 Hydroxyethyl Acrylate 750.002-Ethylhexyl Acrylate 1000.00 Dimethylaminoethyl methacrylate 250.00Charge 4 2-butoxy ethanol 250.00

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at an addition rate of 30.0 grams/hour over 2.5 hours.After 15 minutes charge 3 was added to reactor at an addition rate of−1000 grams/hour over 2 hours. During the monomer addition thetemperature was maintained at 150° C. at 100 PSI. After charge 2 andcharge 3were in the reactor, the reaction mixture was held for 2 hours.The reactor was then cooled to 80° C., and vacuum-stripped for 30minutes. Charge 4 was added over 15 minutes at 1000 grams/hour. Thefinal solids of the resulting polymer was determined to be 86.49% at110° C. for one hour. The copolymer had M_(n=)2900 and M_(w)/M_(n=)3.7.The ¹³C NMR spectrum is consistent with a molar copolymer composition of20% isobutylene, 30% hydroxyethyl acrylate, 10% dimethylaminoethylmethacrylate and 40% 2-ethylhexyl acrylate.

EXAMPLE 5-N-D

Preparation of an aqueous amine salt dispersion of copolymerisobutylene/dimethylaminoethyl methacrylate-alt-hydroxyethylacrylate/2-ethylhexyl acrylate. The ingredients in Table 17 were used tomake the dispersion.

TABLE 17 Parts by weight Ingredients (grams) Deionized water 1103.4 DMPA63.7 Isobutylene/Dimethylaminoethyl 867.2 methacrylate-alt-Hydroxyethylacrylate/2-Ethylhexyl acrylate (Example 5-N) Deionized water 1220.5

The ingredients were added sequentially to a suitable vessel under mildagitation. The final solids were 24.9%.

EXAMPLE 5-O

Synthesis of copolymer isobutylene/dimethylaminoethylmethacrylate-alt-hydroxypropyl acrylate/2-ethylhexyl acrylate/ethylacrylate. The ingredients in Table 18 were used for the polymerization.

TABLE 18 Parts by weight Ingredients (grams) Charge 1 Diisobutylene1000.00 Charge 2 Di-t-amyl Peroxide 85.70 Charge 3 HydroxypropylAcrylate 714.30 2-Ethylhexyl Acrylate 714.30 Dimethylaminoethylmethacrylate 238.10 Ethyl Acrylate 238.10

Charge 1 was added to a 4-liter stirred-stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at addition rate of 34.3 grams/hour over 2.5 hours. After15 minutes Charge 3 was added to reactor at the addition rate 952.2grams/hour over 2 hours. During the monomer addition the temperature wasmaintained at 150° C. at 60 PSI. After charge 2 and charge 3 were in thereactor, the reaction mixture was held for 2 hours. The reactor was thencooled to 25° C. The final solids of the resulting polymer solution wasdetermined to be 76.24% determined at 110° C. for one hour. Thecopolymer had M_(n=)1150 and M_(w)/M_(n=)2.0. The ¹³C NMR spectrum isconsistent with a copolymer composition of 20% diisobutylene, 30%hydroxypropyl acrylate, 10% dimethylaminoethyl methacrylate, 10% ethylacrylate, and 30% 2-ethylhexyl acrylate.

EXAMPLE 5-O-D

Preparation of an aqueous amine salt dispersion of copolymerdiisobutylene/dimethylaminoethyl methacrylate-alt-hydroxypropylacrylate/2-ethylhexyl acrylate/ethyl acrylate. The ingredients in Table19 were used for to make the dispersion.

TABLE 19 Parts by weight Ingredients (grams) Deionized water 986.9 DMPA63.7 Diisobutylene/Dimethylaminoethyl 983.7methacrylate-alt-Hydroxyethyl acrylate/2-Ethylhexyl acrylate/Ethylacrylate (Example 5-O) Deionized water 628.0

The ingredients were added sequentially to a suitable vessel under mildagitation. The final solids were 30.68%.

EXAMPLE 6-P

Synthesis of copolymer hydroxypropyl acrylate/butyl acrylate(comparative example—no diisobutylene). The ingredients in Table 20 wereused for the polymerization.

TABLE 20 Parts by weight Ingredients (grams) Charge 1 Toluene 500.00Charge 2 Di-t-amyl Peroxide 45.00 Charge 3 Hydroxypropyl Acrylate 450.00Butyl Acrylate 1050.00

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at addition rate of 18.00 grams/hour over 2.5 hours.After 15 minutes Charge 3 was added to reactor at an addition rate of750.00 grams/hour over 2 hours. During the monomer addition thetemperature was maintained at 150° C. at 70 PSI. After charge 2 andcharge 3 were in the reactor, the reaction mixture was held for 2 hours.The reactor was then cooled to 25° C., and vented. GC analysis of thereaction mixture showed that all acrylates were reacted. The finalsolids of the resulting polymer were determined to be 76.46% at 110° C.for one hour. The copolymer had Mn=2090 and Mw/Mn=1.9. The 13C NMRspectrum is consistent with a molar copolymer composition of 30%hydroxypropyl acrylate, and 70% butyl acrylate.

EXAMPLE 6-Q

Synthesis of copolymer diisobutylene-alt-hydroxypropyl acrylate/butylacrylate. The ingredients in Table 21 were used for the polymerization.

TABLE 21 Parts by weight Ingredients (grams) Charge 1 Diisobutylene300.00 Charge 2 Di-t-amyl Peroxide 90.00 Charge 3 Hydroxypropyl Acrylate855.00 Butyl Acrylate 1995.00

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at addition rate of 36 grams/hour over 2.5 hours. After15 minutes charge 3 was added to reactor at an addition rate of 1425grams/hour over 2 hours. During the monomer addition the temperature wasmaintained at 150° C. at 70 PSI. After charge 2 and charge 3 were in thereactor, the reaction mixture was held for 2 hours. The reactor was thencooled to 25° C., and vented. GC analysis of the reaction mixture showedthat all acrylates were reacted. The final solids of the resultingpolymer was determined to be 96.60% at 110° C. for one hour. Thecopolymer had M_(n=)4090 and M_(w)/M_(n=)2.3. The ¹³C NMR spectrum wasconsistent with a molar copolymer composition of 8.3% diisobutylene,27.5% hydroxypropyl acrylate, and 64.2% butyl acrylate.

EXAMPLE 6-R

Synthesis of copolymer diusobutylene-alt-hydroxypropyl acrylate/butylacrylate. The ingredients in Table 22 were used for the polymerization.

TABLE 22 Parts by weight Ingredients (grams) Charge 1 Diisobutylene310.00 Charge 2 Di-t-amyl Peroxide 45.00 Charge 3 Hydroxypropyl Acrylate382.50 Butyl Acrylate 892.5

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at addition rate of 18 grams/hour over 2.5 hours. After15 minutes charge 3 was added to reactor at the addition rate 637.5grams/hour over 2 hours. During the monomer addition the temperature wasmaintained at 150° C. at 40 PSI. After charge 2 and charge 3 were in thereactor, the reaction mixture was held for 2 hours. The reactor was thencooled to 25° C. GC analysis of the reaction mixture showed that allacrylates were reacted. The final solids of the resulting polymer wasdetermined to be 92.60% at 110° C. for one hour. The copolymer hadM_(n=)2280 and M_(w)/M_(n=)1.9. The ¹³C NMR spectrum was consistent witha molar copolymer composition of 15.6% diisobutylene, 25.3%hydroxypropyl acrylate, and 59.1% butyl acrylate.

EXAMPLE 6-S

Synthesis of copolymer diisobutylene-alt-hydroxypropyl acrylate/butylacrylate. The ingredients in Table 23 were used for the polymerization.

TABLE 23 Parts by weight Ingredients (grams) Charge 1 Diisobutylene450.00 Charge 2 Di-t-amyl Peroxide 45.00 Charge 3 Hydroxypropyl Acrylate382.50 Butyl Acrylate 892.50

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at an addition rate of 18 grams/hour over 2.5 hours.After 15 minutes charge 3 was added to reactor at an addition rate of637.5 grams/hour over 2 hours. During the monomer addition thetemperature was maintained at 150° C. at 40 PSI. After charge 2 andcharge 3 were in the reactor, the reaction mixture was, held for 2hours. The reactor was then cooled to 25° C. GC analysis of the reactionmixture showed that all acrylates were reacted. The final solids of theresulting polymer was determined to be 89.41% at 110° C. for, one hour.The copolymer had M_(n=)2000 and M_(w)/M_(n=)1.8. The ¹³C NMR spectrumwas consistent with a molar copolymer composition of 21.76%diisobutylene, 23.47% hydroxypropyl acrylate, and 54.77% butyl acrylate.

EXAMPLE 6-T

Synthesis of copolymer diisobutylene-alt-hydroxypropyl acrylate/butylacrylate. The ingredients in Table 24 were used for the polymerization.

TABLE 24 Parts by weight Ingredients (grams) Charge 1 Diisobutylene750.00 Charge 2 Di-t-amyl Peroxide 45.00 Charge 3 Hydroxypropyl Acrylate337.50 Butyl Acrylate 787.50

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the, reactor was set at 500rpm and the reactor temperature was adjusted to 150° C. Charge 2 wasadded to the reactor at addition rate of 18 grams/hour over 2.5 hours.After 15 minutes Charge 3 was added to reactor at the addition rate562.5 grams/hour over 2 hours. During the monomer addition thetemperature was maintained at 150° C. at 55 PSI. After charge 2 andcharge 3 were in the reactor, the reaction mixture was held for 2 hours.The reactor was then cooled to 25° C. GC analysis of the reactionmixture showed that all acrylates were reacted. The final solids of theresulting polymer were determined to be 79.48% at 110° C. for one hour.The copolymer had M_(n=)1180 and M_(w)/M_(n=)1.7. The ¹³C NMR spectrumwas consistent with a copolymer composition of 26.30%, diisobutylene,22.10% hydroxypropyl acrylate, and 51.60% butyl acrylate.

EXAMPLE 7-U

Synthesis of copolymer diisobutylene-alt-hydroxypropyl acrylate/butylacrylate/acrylic acid. The ingredients in Table 25 were used for thepolymerization,

TABLE 25 Parts by weight Ingredients (grams) Charge 1 Diisobutylene1000.00 Charge 2 Di-t-amyl Peroxide 91.30 Charge 3 HydroxypropylAcrylate 785.60 Butyl Acrylate 1207.20 Acrylic Acid 50.00

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at addition rate of 36.50 grams/hour over 2.5 hours.After 15 minutes charge 3 was added to the reactor at an addition rateof 1021.4 grams/hour over 2 hours. During the monomer addition thetemperature was maintained at 150° C. at 60 PSI. After charge 2 andcharge 3 were in the reactor, the reaction mixture was held for 2 hours.The reactor was then cooled to 25° C. GC analysis of the reactionmixture showed that all acrylates were reacted. The final solids of theresulting polymer was determined to be 82.67% at 110° C. for one hour.The copolymer had M_(n=)1770 and M_(w)/M_(n=)2.4. The ¹³C NMR spectrumwas consistent with a molar copolymer composition of 20% diisobutylene,30% hydroxypropyl acrylate, 2% acrylic acid, and 48% butyl acrylate.

EXAMPLE 7-V

Synthesis of copolymer diisobutylene-alt-hydroxypropyl acrylate/butylacrylate/acrylonitrile. The ingredients in Table 26 were used for thepolymerization.

TABLE 26 Parts by weight Ingredients (grams) Charge 1 Diisobutylene1000.00 Charge 2 Di-t-amyl Peroxide 91.30 Charge 3 HydroxypropylAcrylate 785.60 Butyl Acrylate 1207.20 Acrylonitrile 50.00

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at addition rate of 36.50 grams/hour over 2.5 hours.After 15 minutes charge 3 was added to the reactor at an addition rateof 1021.4 grams/hour over 2 hours. During the monomer addition thetemperature was maintained at 150° C. at 60 PSI. After charge 2 andcharge 3 were in the reactor, the reaction mixture was held for 2 hours.The reactor was then cooled to 25° C. GC analysis of the reactionmixture showed that all acrylates were reacted. The final solids of theresulting polymer was determined to be 82.92% at 110° C. for one hour.The copolymer had M_(n=)1940 and M_(w)/M_(n=)2.3. The ¹³C NMR spectrumis consistent with a molar copolymer composition of 20% diisobutylene,30% hydroxypropyl acrylate, 2% acrylonitrile, and 48% butyl acrylate.

EXAMPLE 7-W

Synthesis of copolymer diisobutylene-alt-hydroxypropyl acrylate/butylacrylate/hydroxyethyl acrylate. The ingredients in Table 27 were usedfor the polymerization.

TABLE 27 Parts by weight Ingredients (grams) Charge 1 Diisobutylene1000.00 Charge 2 Di-t-amyl Peroxide 91.30 Charge 3 HydroxypropylAcrylate 392.80 Hydroxyethyl Acrylate 392.80 Butyl acrylate 1207.90

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was then pressurized with nitrogen providing a 5psig pad on the reactor. The agitation on the reactor was set at 500 rpmand the reactor temperature was adjusted to 150° C. Charge 2 was addedto the reactor at addition rate of 36.50 grams/hour over 2.5 hours.After 15 minutes charge 3 was added to the reactor at an addition rateof 996.4 grams/hour over 2 hours. During the monomer addition thetemperature was maintained at 150° C. at 60 PSI. After charge 2 andcharge 3 were in the reactor, the reaction mixture was held for 2 hours.The reactor was then cooled to 25° C. GC analysis of the reactionmixture showed that all acrylates were reacted. The final solids of theresulting polymer were determined to be 81.17% determined at 110° C. forone hour. The copolymer had M_(n=)1700 and M_(w)/M_(n=)2.4. The ¹³C NMRspectrum is consistent with a copolymer composition of 20%diisobutylene, 15% hydroxypropyl acrylate, 15% hydroxyethyl acrylate,and 50% butyl acrylate.

EXAMPLE 7-X

Synthesis of copolymer diisobutylene/styrene-alt-hydroxpropylacrylate/butyl acrylate/isobornyl acrylate. The ingredients in Table 28were used for the polymerization.

TABLE 28 Parts by weight Ingredients (grams) Charge 1 Diisobutylene1000.00 Charge 2 Di-t-amyl Peroxide 90.00 Charge 3 HydroxypropylAcrylate 900.00 Isobornyl Acrylate 400.00 Butyl acrylate 500.00 Styrene200.00

Charge 1 was added to a 4-liter stirred stainless steel pressurereactor. The reactor was pressurized with nitrogen providing a 5 psigpad on the reactor. The agitation on the reactor was set at 500 rpm andthe reactor temperature was adjusted to 150° C. Charge 2 was added tothe reactor at an addition rate of 36 grams/hour over a 2.5 hour period.After 15 minutes Charge 3 was added to reactor at an addition rate of1000 grams/hour over a 2 hour period. During the monomer addition thetemperature was maintained at 150° C. and 60 PSI. After Charges 2 and 3were in the reactor, the reaction mixture was held for 2 hours. Thereactor was than cooled to 25° C. GC analysis of the reaction mixtureshowed that all acrylates and styrene were reacted. The final solids ofthe resulting polymer was 83.12% determined at 110° C. for one hour. Thecopolymer had Mn=1400 and Mw/Mn=2.4. The ¹³C NMR spectrum was consistentwith a molar copolymer composition of 22.1% diusobutylene, 35.0%hydroxypropyl acrylate, 15.6% isobornyl-acrylate, 7.8% styrene, and19.5% butyl acrylate.

EXAMPLE 7-Y

Synthesis of alternating copolymer diisobutylene-alt-hydroxypropylacrylate/Butyl acrylate/N-butoxymethyl acrylamide. The ingredients inTable 29 were used in polymerization technique.

TABLE 29 Parts by weight Ingredients (grams) Charge 1 Diisobutylene100.00 Charge 2 t-Amylperoxy 12 (2-ethyl hexanoate) Charge 3N-butoxymethyl acrylamide 10.00 (50% solution in butanol) HydroxypropylAcrylate 78.50 Butyl Acrylate 120.70

Charge 1 was added to a reaction flask equipped with an agitator, athermocouple, and a N₂ inlet, placed under a blanket of N₂, and heatedto 103° C. Charge 2 was added to the reactor over a 2.5 hour period.After 15 minutes. Charge 3 was added to the reactor over a 2 hourperiod. During the monomer addition the temperature was maintained at103° C. After Charges 2 and 3 were in the reactor, the reaction mixturewas held for 2 hours. The reactor was then cooled to 25° C. GC analysisof the reaction mixture showed that all acrylates and acrylamide werereacted. The reaction flask was then equipped for simple vacuumdistillation and the reaction mixture heated to 80° C. to remove theunreacted diisobutylene. The reaction mixture was cooled to 40° C. and40 grams of Dowanol PM was added to the reaction mixture. The solids ofthe resulting polymer was 91% (in butyl alcohol) determined at 110° C.for one hour. The copolymer had Mn=4420 and Mw/Mn=3.4. The ¹³C NMRspectrum was consistent with a molar copolymer composition of 28%Diisobutylene, 28% Hydroxypropyl acrylate, 2% N-butoxymethyl acrylamide,and 42% Butyl acrylate.

EXAMPLE 7-Z

Synthesis of alternating copolymer diisobutylene-alt-hydroxypropylacrylate/butyl acrylate/poly(ethylene glycol) methyl ether acrylate. Theingredients in Table 30 were used in the polymerization technique.

TABLE 30 Parts by weight Ingredients (grams) Charge 1 Diisobutylene100.00 Charge 2 t-Amylperoxy(2-ethyl 12 hexanoate) Charge 3Poly(ethylene glycol) 5.00 methyl ether acrylate Hydroxypropyl Acrylate78.50 Butyl Acrylate 120.70

Charge 1 was added to a reaction flask equipped with an agitator, athermocouple, and a N₂ inlet, placed under a blanket of N₂, and heatedto 103° C. Charge 2 was added to the reactor over a 2.5 hour period.After 15 minutes Charge 3 was added to the reactor over a 2 hour period.During the monomer addition the temperature was maintained at 103° C.After Charges 2 and 3 were in the reactor, the reaction mixture was heldfor 2 hours. The reactor was than cooled to 25° C. GC analysis of thereaction mixture showed that all acrylates were reacted. The solids ofthe resulting polymer were 78.4% determined at 110° C. for one hour. Thecopolymer had Mn=5230 and Mw/Mn=1.9. The ¹³C NMR spectrum was consistentwith a molar copolymer composition of 26% diisobutylene, 25%hydroxypropyl acrylate, 2% poly(ethylene glycol) methyl ether acrylate,and 47% butyl acrylate.

EXAMPLE 8-AA

Synthesis of alternating copolymer diisobutylene-alt-methylacrylate/butyl acrylate. The ingredients in Table 31 were used in thepolymerization technique.

TABLE 31 Parts by weight Ingredients (grams) Charge 1 Diisobutylene336.00 Charge 2 t-Amylperoxy(2-ethyl 12 hexanoate) Charge 3 Methylacrylate 21.50 Butyl Acrylate 128.00

Charge 1 was added to a reaction flask equipped with an agitator, athermocouple, and a N₂ inlet, placed under a blanket of N₂, and heatedto 103° C. Charge 2 was added to the reactor over a 4.5 hour period.After 15 minutes Charge 3 was added to the reactor over a 4 hour periodDuring the monomer addition the temperature was maintained at 103° C.After Charges 2 and 3 were in the reactor, the reaction mixture was heldfor 2 hours. The reactor was than cooled to 25° C. GC analysis of thereaction mixture showed that all acrylates were reacted. The reactionflask was then equipped for simple vacuum distillation and the reactionmixture heated to 80° C. to remove the unreacted diisobutylene. Thereaction mixture was cooled to 40° C. and 60 grams of Dowanol PM wasadded. The solids of the resulting polymer were 75.6% determined at 110°C.; for one hour. The copolymer had M_(n=)1530 and M_(w)/M_(n=)3.2. The³C NMR spectrum was consistent with a molar copolymer composition of39.4% diisobutylene, 11.5% methyl acrylate, and 49.1% butyl acrylate.

EXAMPLE 8-BB

Synthesis of alternating copolymer diisobutylene-alt-isobornylacrylate/butyl acrylate. The ingredients in Table 32 were used in thepolymerization technique.

TABLE 32 Parts by weight Ingredients (grams) Charge 1 Diisobutylene224.00 Charge 2 t-Amylperoxy(2-ethyl 12 hexanoate) Charge 3 Isobornylacrylate 104.2 Butyl Acrylate 64.1

Charge 1 was added to a reaction flask equipped with an agitator, athermocouple, and a N₂ inlet, placed under a blanket of N₂, and heatedto 103° C. Charge 2 was added to the reactor over a 3.5 hour period.After 15 minutes Charge 3 was added to the reactor over a 3 hour period.During the monomer addition the temperature was maintained at 103° C.After Charges 2 and 3 were in the reactor, the reaction mixture was heldfor 2 hours. The reactor was then cooled to 25° C. GC analysis of thereaction mixture showed that all acrylates were reacted. The reactionflask was then equipped for simple vacuum distillation, the reactionmixture was heated to 80° C. to remove the unreacted diisobutylene. Thereaction mixture was cooled to 40° C. and 60 grams of Dowanol PM wasadded. The solids of the resulting polymer were 72.9% determined at 110°C. for one hour. The copolymer had M_(n=)1880 and M_(w)/M_(n=)2.0. The

¹³C NMR spectrum was consistent with a molar copolymer composition of31.8,% Diisobutylene, 35.5% Isobornyl acrylate and 32.7% Butyl acrylate.

EXAMPLE 8-CC

Synthesis of alternating copolymer diisobutylene-alt-acrylic acid. Theingredients in Table 33 were used in the polymerization technique.

TABLE 33 Parts by weight Ingredients (grams) Charge 1 Dowanol PM 500.00Diisobutylene 896.00 Charge 2 t-Amylperoxy(2-ethyl 24 hexanoate) Charge3 Acrylic acid 400.00

Charge 1 was added a reaction flask equipped with an agitator, athermocouple, and a N₂ inlet, placed under a blanket of N₂, and heatedto 103° C. Charge 2 was added to the reactor over a 3.5 hour period.After 15 minutes Charge 3 was added to the reactor over a 3 hour period.During the monomer addition the temperature was maintained at 103° C.After Charges 2 and 3 were in the reactor, the reaction mixture was heldfor 2 hours. The reactor was than cooled to 25° C. GC analysis of thereaction mixture showed that the acrylic acid was completely reacted.The reaction flask was than equipped for simple vacuum distillation andthe reaction mixture heated to 80° C. to remove unreacted diisobutyleneand solvent. The solids of the resulting polymer were 99.1% determinedat 110° C. for one hour. The copolymer had M_(n=)1860 andM_(w)/M_(n=)2.4. The ¹³C NMR spectrum was consistent with a molarcopolymer composition of 40% Diisobutylene and 60% Acrylic acid.

EXAMPLE 8-DD

This example describes the preparation of adiisobutylene/styrene/glycidyl acrylate/hydroxypropyl acrylatealternating copolymer. The copolymer was prepared as described belowfrom the ingredients in Table 34:

TABLE 34 Parts by weight Ingredients (grams) Diisobutylene 1000n-Methoxypropanol¹ 700 Styrene 330 Glycidyl acrylate 120 Hydroxypropylacrylate 150 t-Amyl peroxy-2-ethylhexanoate 34 t-Amylperoxy-2-ethylhexanoate 8 t-Amyl peroxy-2-ethylhexanoate 12 ¹DOWANOL ®PM solvent, Dow Chemical Co., Midland MI

The diisobutylene and n-methoxypropanol were charged to a reactionvessel capable of holding pressure consistent with the reactionconditions. This mixture was then heated to reflux, approximately 100°C. A mixture of styrene, glycidyl acrylate, and hydroxypropyl acrylatewas added over a period of 3 hours. At the same time, the first chargeof t-amyl peroxy-2-ethylhexanoate was added over 3 hours. After theadditions the copolymer was held for 2 hours at reflux. A sample forsolids was used to determine whether the reaction was complete. Afterthe hold period, 8 grams of t-amyl peroxy-2-ethylhexanoate was added,and the reaction held for 8 hours. A second addition of 12 grams t-amylperoxy-2-ethylhexanoate followed, and the reaction held an additional 5hours at reflux. At that point, the reaction had reached the theoreticalnon-volatile content of 47.3%. The unreacted diisobutylene was thenremoved under vacuum at 90–95° C. The final product was filtered througha 5 micron bag.

EXAMPLE 8-EE

This example describes the preparation of a sulfonium group-containingdiisobutylene/acrylic resin from a diisobutylene/hydroxypropylacrylate/glycidyl methacrylate/2-ethylhexyl acrylate alternatingco-polymer using di-tert-amyl peroxide as an initiator. The startingcopolymer was prepared as described below from the ingredients in Table34A.

TABLE 34A Parts by weight Ingredients (grams) Diisobutylene 1000Di-tert-Amyl Peroxide 45 Hydroxypropyl Acrylate 300 GlycidylMethacrylate 300 2-Ethylhexyl Acrylate 1400

The diisobutylene was charged to a reaction vessel capable of holdingpressure consistent with the reaction conditions. The diisobutylene washeated to 150° C. The di-tert-amyl peroxide was added over 2.5 hours. 15Minutes after starting the di-tert-amyl peroxide addition, thehydroxypropyl acrylate, glycidyl methacrylate, and 2-ethylhexylacrylate, previously combined and mixed, was added over 2.0 hours. Afterthe additions were complete the copolymer was held at 150° C. for 2.0hours then cooled to ambient temperature. The polymer was found to havean epoxy equivalent weight of 1650. Percent non-volatile was measured to75% with residual non-volatiles consisting of diisobutylene anddecomposition products from the initiator. The sulfonium functionalresin was prepared as described below from the ingredients in Table 34B.

TABLE 34B Parts by Weight Ingredients (grams) Starting copolymer ofTable 34A 771.5 Thiodiethanol 122.0 Deionized Water 27.0 Lactic Acid40.9 Deionized Water 884.5 Deionized Water 572.2

The diisobutylene-acrylic copolymer of Table 34A was charged to areaction vessel and heated to 80° C. Thiodiethanol, the first charge ofdeionized water, and lactic acid were then added to the reaction vessel.The reaction mixture was then held at 80° C. After five hours, an acidvalue of 6.5 and a sulfonium level of 0.185 meq/g were obtained. At thispoint the resin was dispersed with agitation into the second charge ofdeionized water which was at 25° C. After mixing for 30, minutes thedispersion was reduced to the proper solids with the final charge ofdeionized water. The dispersion had a non-volatile content of 25%.

EXAMPLE 9

This example set describes the preparation of electrodepositable coatingcompositions in the form of electrodeposition baths. Theelectrodepositable coating compositions were prepared as described belowusing the ingredients in Table 35.

TABLE 35 Parts by weight (grams) Example 9 Example Example Ingredient(Comparative) 9-N 9-O E8003¹ 817.0 735.3 735.3 Amine salt 128.8dispersion of Example 5-N-D Amine salt 108.5 dispersion of Example 5-O-DE8008² 230.7 230.7 230.7 Deionized water 2752.4 2725.6 2725.6 ¹Acationic polyurethane resin available from PPG Industries, Inc. ²Apigment paste available from PPG Industries, Inc.

The E8003 cationic polyurethane was combined with 500.0 grams of thedeionized water and stirred thoroughly. The cationic additives ofExamples N and O were combined with, 300.0 grams of the deionized waterand stirred. This solution was then added to the reduced cationicpolyurethane. Finally, the E8008 pigment paste was reduced with theremaining amount of deionized water, then added to the resin mixtureunder agitation.

The electrodepositable coating compositions were evaluated for oil-spotresistance. The purpose of this procedure is to measure a coatingsresistance to visible defects such as craters, caused by surface oilcontamination. The substrate used in this procedure was 4″×12″ zincphosphated cold rolled steel panels available as APR 28630 from ACTLaboratories, Inc., Hillsdale, Mich. The substrate was firstelectrocoated using ED7951 (a conductive black coating available fromPPG Industries, Inc.) applied @ 0.75 mil. This first coat was cured for25 minutes at 375° F. Three conveyor oils were used to test the oil-spotresistance of the electrodepositable coatings:

-   1. Moluballoy ICO Oil (ICO) chain oil from TRIBOL CORP., Sterling    Heights, Mich.-   2. Lubercon Series I (LUB) chain oil from LUBERCON MAINTENANCE,    Fremont, Mich.-   3. P80—a light transportation oil from Germany.

Prior to preparing the panels, the bath compositions were warmed to thecoat out temperature of 90° F. The panel to be tested was placed on thebench, laying a divider on the panel, which divides the panel surfaceinto three sections protected from one another. A toothbrush was dippedinto the ICO oil, excess oil blotted off with a paper towel, and the oilgently flicked over the top section of the panel to give a spatteredpattern of small droplets. The LUB oil was applied in a similar manneronto the middle section, and the P80 light transportation oil wasapplied to the bottom third of the panel. A separate toothbrush was usedfor each oil. The prepared panel was then placed immediately into thebath composition being tested and the electrodepositable composition wasapplied. Electrodeposition was carried out at 180 volts for 135 seconds.The test panels were cured for 30 minutes at 350° F. These conditionsyielded approximately 1.4 mils of cured film. The panels were thenvisually inspected for defects and rated versus the comparative example(comparative rating=0). Results are shown in Table 36.

TABLE 36 Bath ICO LUB P80 Example 9 0 0 0 Comparative Example 9-N ++ ++++ Example 9-O ++ ++ ++

These examples demonstrate the use the alternating copolymers of thepresent invention in an electrodeposition coating composition.

EXAMPLE 10

A waterborne basecoat was prepared using two component parts, an organicmix and an aqueous mix as shown in Table 37. The organic mix wasprepared by mixing each component to uniformity. Similarly, the aqueousmix was prepared by mixing each component to uniformity. The organic mixwas then added to the aqueous mix with agitation. The premix andadjustment mix were prepared by mixing the components and adding themboth to the combination of the organic mix and the aqueous mix to form awaterborne basecoat coating. The pH of the coating was adjusted to 8.5.The Viscosity was adjusted to 25 seconds measured on a #4 Ford cup atroom temperature (71°–72° F.).

TABLE 37 Example A Example B Example C Material (grams) (grams) (grams)Organic Mix Melamine¹ 25.0 25.0 25.0 Melamine² 6.3 6.3 6.3 LightStabilizer³ 1.4 1.4 1.4 Pigment Paste⁴ 23.5 23.5 23.5 Pigment Paste⁵ 6.56.5 6.5 Phosphatized Epoxy⁶ 0.4 0.4 0.4 N-butoxy propanol 45.0 45.0 45.0Aqueous mix Mineral Spirits⁷ 6.0 6.0 6.0 Styrene-Acrylic Resin⁸ 132.1Latex Polyester* 140.0 Polymer of Example 2-D 71.1 D.I. water 50.0 50.050.0 Waterborne acrylic 23.1 23.1 23.1 dispersion⁹ 50 wt. % DMEA in 4.54.5 4.5 D.I. water Pre-mix D.I. water 10.0 10.0 10.0 50 wt. % DMEA in4.5 4.5 4.5 D.I. water Oligomeric Polyester 5.0 5.0 5.0 Adjustment MixD.I. water 43.0 43.0 43.0 50 wt. % DMEA in 1.1 1.1 1.1 D.I. water *Latexexample III of U.S. Pat. No. 6,281,272 to Baley et al. ¹Cymel ® 303,Cytec Industries, West Patterson, NJ ²Cymel ® 385, Cytec Industries³Tinuvin ® 1130, CGL-1130, Ciba Specialty Chemicals, Basel, Switzerland⁴Aqua Paste ® 3620-D23, Silberline Manufacturing, Tamaqua, PA ⁵AquaPaste ® 3700-A23, Silberline Manufacturing ⁶Epon 880 type, 17%phosphoric acid, 83% liquid epoxy, 56% solids in 92/4/4 w/w EGME, xyleneand D.I. water available from Akzo Nobel Chemicals, Arnhem, theNetherlands ⁷Shell Sol ® 71, Shell Chemicals, Houston, TX ⁸Joncryl ®540, S. C. Johnson & Son, Inc. Racine, WI ⁹Waterborne acrylic dispersionof 8.5/18/30/35/8.5 m/m HEA/nBMA/Styr/nBA/AA, 27 wt. % in 2/16/1/81 w/wDMEA/DGME/mineral spirits/D.I. water ¹⁰Oligomeric polyester prepared asdescribed in U.S. Pat. No. 5,356,973 to Taljan et al., Example A.

The film forming compositions of examples A, B, and C were applied overelectrodeposition primer coated steel panels (cold rolled steel panels4″×12″, available as APR4128 from ACT Laboratories, Inc. Hillsdale,Mich.).

The basecoat compositions of were spray applied (2 coats automated spraywith 30 seconds ambient flash between coats) at 60% relative humidityand 21° C., to give a dry film thickness of 15 μm. The panels were bakedhorizontally for 5 minutes at 80° C. The base coated panels were topcoated with a clear isocyanate system (as WTKR-2000, available from PPGIndustries, Inc., Pittsburgh, Pa.) air flashed for 10 minutes and bakedfor 30 minutes at 140° C. to give a film thickness of. 40 to 42 μm.

The appearance and physical properties of the coated panels weremeasured using the following tests with the results shown in Table 38:

20° Gloss—Specular gloss was measured at 20° with a Novo GlossStatistical Glossmeter (Paul N. Gardner Company, Inc., Pompano Beach,Fla.) where higher numbers indicate better performance.

DOI (Distinction of Image)—measured using a Dorigon II (HunterLaboratories) were higher numbers indicate better performance.

Adhesion—adhesion of the coating to the substrate was measured using amultiblade cutter available from Paul N. Gardner Company Inc., with 2.0mm spaced teeth to scribe 2 sets of lines perpendicular to each other,both one inch long. The crosshatch area was taped using tape (#898, 3M,St. Paul, Minn.) to eliminate any damage. A rating of 10 is best (ASTMtest method #D3359)

Chip—chip resistance was measured by the Erichsen chip method (PPGSTM-0802, 2×2000 g, 30 psi) with a rating of 10 being best.

TABLE 38 Coating Test Ex. A Ex. B Ex. C 20° Gloss 85 92 86 DOI 75 73 83Adhesion 10 10 10 Chip 6 9 9−

The data demonstrate that good coating properties that result when thecoating composition of the present invention is used as a waterbornebasecoat.

EXAMPLE 11 Clearcoat

This example demonstrates the use of the present coating composition ina melamine crosslinked clearcoat system.

Each component in Table 39 was mixed sequentially with agitation. Thefinal viscosity was adjusted with 1/1/1 w/w Aromatic 100(ExxonMobil)/methyl n-amyl ketone/xylene and 4/1 w/w methyl n-amylketone/2-butoxy ethanol acetate to 27 seconds measured on a #4 Ford cup(Paul N. Gardner Company) at room temperature (71°–72° F.).

TABLE 39 Example D Example E Example G Material (grams) (grams) ExampleF (grams) MAK 7.3 7.3 7.3 7.3 Xylene 2.2 2.2 2.2 2.2 Aromatic 100¹¹ 7.57.5 7.5 7.5 EGMHE 0.7 0.7 0.7 0.7 Ethanol 3.3 3.3 3.3 3.3 Amino Resin¹²49.9 Amino Resin¹³ 40.0 40.0 40.0 Acrylic Resin** 73.8 Polymer of 71.7Example 1-A Polymer of 60.0 Example 1-B Polymer of 60.0 Example 1-CCatalyst¹⁴ 1.0 1.4 1.2 1.2 Aromatic 100¹¹ 11.0 10.0 3.3 3.3 MAK 11.010.0 3.3 3.3 Xylene 11.0 10.0 3.3 3.3 MAK 16.8 24.0 1.5 2.5 Butylacetate 4.2 6.0 1.5 2.5 **Prepared in 10/46/44 w/w isobutylalcohol/Aromatic 100/xylene using 2,2′-azobis-(2-methyl butyronitrole)(Vazo-67, DuPont). Monomer composition m/m 40% HPA, 1.0% MMA, 19% NBA,18% NBMA, 20% Styr, 2% AA; 71 wt. % polymer solids. ¹¹Exxon MobileCorp., Fairfax, VA ¹³Resimene ® 757, Solutia, St. Louis. MO ¹³Resimene ®755, Solutia ¹⁴Cycat ® Catalyst 600, Cytec Industries (dodecylbenzylsulfonic acid)

The clear coating compositions shown in Table 40 were applied using an8-path Wet Film Applicator, #14 available from Paul N. Gardner Company,Inc., to black electrodeposition primed panels (cold rolled steel panels4″×12″, available as APR28215 from ACT Laboratories, Inc.) at ambienttemperature. The dry film thickness was targeted for about 30 μm (1.6mils). The coated panels were baked for 30 minutes at 141° C.

Physical properties were measured as outlined above except where notedbelow.

Knoop hardness is measured using the Tukon Microhardness InstrumentModel 300 (Wilson Instruments Division of Instron Corporation, Canton,Mass.), higher numbers indicate better performance.

Mar—tested by subjecting the coated panels to scratch testing bylinearly scratching the coated surface with a weighted abrasive paperfor ten double rubs using an Atla ATCC Scratch Tester, Model CM-5 (AtlasElectrical Devices Company, Chicago, Ill.). The abrasive paper used was281Q WETORDRY™ PRODUCTION™ 9 micron polishing paper sheets (3M). Panelswere then rinsed with tap water and carefully patted dry with a papertowel. The 20° gloss was measured as outlined above on the scratchedarea of each test panel. The lowest 20° gloss reading from the scratchedarea is used. The scratch results are reported as 20° mar gloss and thepercent of the, initial gloss retained after scratch testing using thefollowing calculation:

(100×mar gloss)/initial gloss. Higher values for percent of glossretained are desirable.

Acid Etch—resistance to etching is measured by the Sulfuric Acid EtchDroplet Test. A dilute solution of sulfuric acid and deionized water isapplied in droplet form to the cured coating surface and baked for aspecified time and temperature, this can be repeated two times. Panelsare washed with tap water, and patted dry with a paper towel. The acidetch is rated on a scale of (0 to 10), with 0 referring to no visibleetching.

VOC—The determination of the volatile organic compound content (VOC) wasdone using (ASTM D3960).

Craters—the crater robustness of the clear topcoats was measured byobserving dewetting behavior over a steel panel covered with a series ofknown resin contaminants (PPG STM-0868). Clear topcoats were sprayapplied to these panels and baked for 30 minutes at 141° C., highernumbers are better when panels are rated.

TABLE 40 Coating Test Ex. D Ex. E Ex. F Ex. G 20° Gloss 92 87 86 87Tukon 14 10 12 10 (Knoop Hardness) Mar Retention (%) 75 52 15 56 TotalSolids (wt. %) 53 51 52 64 Acid Etch Rating 10 10 3 10 VOC 3.9 * 3.3 2.9Craters 1− * 47.5 * * Not tested

The data demonstrate that good coating properties that result when thecoating composition of the present invention is used in a melaminecrosslinked clearcoat system.

EXAMPLE 12 Clearcoat

This example demonstrates the use of the present coating composition inan isocyanate crosslinked clearcoat system.

Each component in Table 41 was mixed sequentially with agitation. Thefinal viscosity was adjusted to 27 seconds measured on a #4 Ford cup atroom temperature (71°–72° F.)

TABLE 41 Example H Example I Example K Material (grams) (grams) ExampleJ (grams) 3-Ethoxy 17.6 propionate MEPGA 9.3 Acrylic Resin** 68.3Polymer of 99.9 Example 1-A Polymer of 60.7 Example 1-B Polymer of 57.9Example 1-C Polyisocyanate¹⁵ 47.6 Polyisocyanate¹⁶ 23.5 56.2 60.1Dibutyltin dilaurate 0.05 0.05 0.05 0.05 3-Ethoxy propionate 5.0 26.021.0 27.0 MEPGA 5.0 16.0 21.0 27.0 **as described in Table 32¹⁵Desmodur ® N-3390, Bayer Inc., Pittsburgh, PA ¹⁶Desmodur ® Z-4470,Bayer Inc.

The test panels and physical properties in Table 42 were determined asdescribed in coating example 11.

TABLE 42 Coating Test Ex. H Ex. I Ex. J Ex. K 20° Gloss 86 82 88 80Tukon 13 15 10 13 (Knoop Hardness) Mar Retention (%) 18 9 72 10 TotalSolids (wt. %) 52 63 63 58 Acid Etch Rating 4 1 10 1 VOC 3.9 * 3.3 *Craters 1− * 47.5 * * Not tested

The data demonstrate that good coating properties that result when thecoating composition of the present invention is used in an isocyanatecrosslinked clearcoat system.

EXAMPLE 13 Clearcoat

This example demonstrates the use of the present coating composition inan aminoplast crosslinked clearcoat system.

Each component in Table 43 was mixed sequentially with agitation to forma clearcoat coating. The Clearcoat formulations were reduced, with a 4:1w/w mixture of methyl ethyl ketone and 2-butoxy ethanol acetate to a33±1 #4 Ford cup viscosity at room temperature (71°–72° F.).

TABLE 43 Ex. L Ex. M Ex. N Ex. O Ex. P Ex. Q Material (g) (g) (g) (g)(g) (g) Xylene 2.3 2.3 2.3 2.3 2.3 2.3 Aromatic 100¹¹ 8.5 8.5 8.5 8.58.5 8.5 EGMHE 0.6 0.6 0.6 0.6 0.6 0.6 Methyl Ethyl 8.5 8.5 8.5 8.5 8.58.5 Ketone Light Stabilizer¹⁷ 1.5 1.5 1.5 1.5 1.5 1.5 Light Stabilizer¹⁸1.5 1.5 1.5 1.5 1.5 1.5 Fumed Silica 16.2 16.2 16.2 16.2 16.2 16.2Dispersion Amino Resin¹² 47.0 47.0 47.0 47.0 47.0 47.0 Ethanol 5.5 5.55.5 5.5 5.5 5.5 Acrylic Resin*** 68.6 Polymer of Example 59.3 4-IPolymer of Example 56.7 4-J Polymer of Example 55.6 4-K Polymer ofExample 56.8 4-L Polymer of Example 55.0 4-M Light Stabilizer¹⁹ 0.4 0.40.4 0.4 0.4 0.4 Flow Additive²⁰ 0.7 0.7 0.7 0.7 0.7 0.7 Flow Additive²¹0.5 0.5 0.5 0.5 0.5 0.5 Catalyst¹⁴ 0.9 0.9 0.9 0.9 0.9 0.9 ***Resincomposition m/m 40% HPA/18% NBMA/19% NBA/20% Styr/2% AA/1% MMA ¹¹ExxonMobile Corp., Fairfax, VA. ¹²Resimene ® 757, Solutia, Inc., St. Louis.MO ¹⁴Cycat ® Catalyst 600, Cytec Industries(dodecylbenzyl sulfonic acid)¹⁷Chisorb 328, Chitec Chemical Co., Taipei Taiwan ¹⁸Tinuvin ® 900, CibaSpecialty Chemicals ¹⁹Tinuvin ® 292, Ciba Specialty Chemicals²⁰Multiflow, available from Solutia, Inc. ²¹PBA (polybutyl acrylate),available from E. I. du Pont de Nemours and Company

The film-forming compositions of Examples L–Q were applied to pigmentedbasecoats to form color plus clear composite coatings over a steelsubstrate with electrodeposition primer and primer surfacer. Thebasecoat used for the examples was ODCT6373. (black), available from PPGIndustries, Inc. The primer used was FCP-6759, commercially availablefrom PPG Industries, Inc. The electrodeposition primer used on the steelwas ED5000, commercially available from PPG Industries, Inc.

The basecoat was spray applied in two coats to the electrodepositionprimed steel panels at a temperature of about 75° F. (24° C.). AnApproximately 60 second flash time was allowed between the two basecoatapplications. After the second basecoat application, a 90 seconds flashtime was allowed at about 75° F. (24° C.) before the application of theclear coating composition. The clear coating compositions of ExamplesL–Q were each applied to a basecoated panel in two coats with a 60second flash time at 75° F. (24° C.) allowed between coats. Thecomposite coating was allowed to air flash at about 75° F. (24° C.) for8–10 minutes before baking at 285° F. (141° C.) to cure both thebasecoat and the clearcoat. The panels were baked in a horizontalposition. The colored panel for each clearcoat example was baked for 30minutes and used to test for physical properties. The physical propertydata is shown in Table 44.

TABLE 44 Coating Test Ex. L Ex. M Ex. N Ex. O Ex. P Ex. Q 20° Gloss 9086 88 88 89 87 DOI 90 95 92 92 90 89 Tukon 12 8 10 11 11 11 (KnoopHardness) Mar Retention (%) 96 91 94 99 98 95 Total Solids 57 66 59 5959 59 (wt. %) Acid Etch Rating 10 * 10 10 2 4 * Not tested

The data demonstrate that good coating properties that result when thecoating composition of the present invention is used in an aminocrosslinked clearcoat system.

EXAMPLE 14 Basecoat

This example demonstrates the use of the present coating composition inan aminoplast crosslinked basecoat system.

Each component in Table 45 was mixed sequentially with agitation to forma basecoat coating. The basecoats of Examples R–U were reduced with a1:1 w/w/mixture of Xylene and Aromatic 100 (Exxon Mobile Corp) to aspray viscosity of 18, at ambient temperature (76° F.), with a # 4 Fordcup.

TABLE 45 Ex. R Ex. S Ex. T Ex. U Material (g) (g) (g) (g) DIBK 55.1 55.155.1 55.1 Xylene 55.1 55.1 55.1 55.1 Methyl Ethyl Ketone 18.8 18.8 18.818.8 N-butyl acetate 17.6 17.6 17.6 17.6 Light Stabilizer²⁴ 10.6 10.610.6 10.6 Microgel²⁵ 87.0 87.0 87.0 87.0 Amino Resin¹² 171.0 171.0 171.0171.0 Polymer of Example 3-H 91.9 Polymer of Example 3-E 84.8 Polymer ofExample 3-F 89.8 Polymer of Example 3-G 84.8 Bentonite Dispersion 87.387.3 87.3 87.3 Phosphatized Epoxy 1.2 1.2 1.2 1.2 Polymer SolutionCatalyst¹⁴ 5.7 5.7 5.7 5.7 Magenta Pigment Paste 42.4 42.4 42.4 42.4 RedPigment Paste 134.8 134.8 134.8 134.8 Orange Mica²⁶ 1.2 1.2 1.2 1.2Copper Mica²⁷ 6.9 6.9 6.9 6.9 Russet Mica²⁸ 32.0 32.0 32.0 32.0 AluminumPaste²⁹ 1.3 1.3 1.3 1.3 ¹²Resimene ® 757, Solutia, Inc., St. Louis. MO¹⁴Cycat ® Catalyst 600, Cytec Industries (dodecylbenzyl sulfonic acid)²⁴Tinuvin ® 328, Ciba Specialty Chemicals ²⁵Prepared as described inexample 2 of U.S. Pat. No. 4,147,688 to Makhlouf et al. ²⁶Super BrightOrange Mica, Englehard Corp., Iselin, NJ ²⁷Fine Copper Mica, EnglehardCorp. ²⁸Russet Mica, EM Industries, Inc., Hawthorne, NJ ²⁹Fine AluminumPaste, Silberline Manufacturing

The compositions of Examples R–U were spray applied under a clearcoatand over primed and electrodeposition coated steel panels to form acolor-plus-clear composite coatings. The panels used were 4″×12″ coldrolled steel panels (APR40026, available from ACT Laboratories, Inc.)coated with electrodeposition coating ED5240, available from PPGIndustries, Inc. The test panels were coated with FCP6519 primersurfacer available from PPG Industries, Inc. The basecoats of examplesR–U were automated spray applied in two coats to the primed andelectrodeposition coated steel panels at 76° F. and at 27% relativehumidity. A dry film thickness of about 18 to 20 (0.7–0.8 mils) wastargeted. The basecoat was allowed to flash at ambient temperature about10 to 15 minutes.

The clear coating applied over the basecoat compositions of Examples R–Uwas ODCT8000 carbamate clearcoat, available from PPG Industries, Inc.The dry film thickness of the clearcoat was targeted for 46 to 51 μm(1.8–2 mils). The clearcoat was allowed to air flash at ambienttemperature for 10 to 15 minutes. Panels prepared from each coating werebaked for 30 minutes at 285° F. (141° C.) in a horizontal position.

The physical properties of the coated panels were measured using thetests outlined below with the results shown in Table 46:

20° Gloss—Initial 20 degrees gloss was measured with a Haze-Gloss Metter(Byk-Gardner USA, Columbia, Md.), where higher numbers indicate betterperformance.

Mar was tested by subjecting the coated panels to scratch testing bylinearly scratching the coated surface with a weighted abrasive paperfor ten double rubs using an Atlas AA TCC Crockmeter, Model CM-5 (AtlasElectrical Devices Company, Chicago, Ill.). The abrasive paper used was281 Q WETORDRY Production 2 micron polishing paper sheets (3M). Panelswere rinsed with tap water and carefully patted dry with a paper towel.The 20 gloss was measured (using the same glossmeter as that used forthe 20° gloss measurement) at three places on the marred area (the endsand the center). The average of these three readings was recorded as themar gloss. Mar resistance was calculated and recorded using thefollowing equation:(Marred Gloss/Initial Gloss)×100Higher values are desirable.

Water spot resistance was measured by placing six droplets of tap wateron the cured coating surface and baked for 30 minutes at 60° C. (140°F.). After baking, the panels were washed with soap and water, rinsed,dried and rated. The water spot is rated on a scale of (0 to 6), with 0being excellent, i.e., no etch marking at all. (Technical SolventbaseQWI-16).

Acid spot resistance was measured by placing a droplet of a 0.6Nhydrochloric acid solution and a droplet of 0.6N sulfuric acid solutionon the cured coating surface and baking for 30 minutes at 49° C. (120°F.). After baking, the panels were washed immediately with soap andwater, rinsed, dried and rated. The acid spot is rated on a scale of (0to 6), with o being excellent, i.e. no etch marking at all (TechnicalSolventbase QWI-1).

Adhesion and Chip—To test for recoat adhesion and recoat chip, anoriginal basecoated and clearcoated panel was given another layer ofbasecoat and clearcoat The original basecoat/clearcoat film was bakedfor 60 minutes at 155° C., (310° F.) then allowed to cool for at least30 minutes. The, panel was then coated with a basecoatand a clearcoat,and baked for 17 minutes at 135° C. (275° F.) After baking, the panelwas aged for a minimum of 2 hours, then cut in two halves. On one halfthe recoat adhesion test was performed using a Cross-Cut Tester(Byk-Chemie, Wesel, Germany) by cutting through the film to thesubstrate in one steady motion. A second cut was made, perpendicular toand centered on the first cut. Then the panel was wiped dry with a papertowel and a lap of tape (Scotch Brand 800, 3M) was placed and rubbedfirmly over the grid. The tape was removed in a rapid upward motion.

Adhesion—The recoat adhesion was rated on a scale of (0% to 100%), with.100% indicating that no paint was removed, all edges are completelysmooth, and all lattice squares are intact.

Chip—Recoat chip was performed on the other half of the panel byinitially placing the panel in a Kopalk walk in freezer for a minimum of4 hours before chipping. The panel was chipped using a Multi TestGravelometer, Model MTG (Q Panel Lab Products, Cleveland, Ohio). Thepanel was placed in the gravelometer at 00 degree angle, the airpressure was adjusted at 70±0.2 PSI and the panels were shot with three,pints of gravel. The recoat chip was rated first for chip size on ascale of (A to D) with A indicating chips less than 1 mm, B indicatingchips of 1–3 mm, C indicating chips of 3–6 mm, and D indicating chipsgreater than 6 mm. Also, chip quantity was rated on a scale of 0 to 9with 9 being excellent, i.e. no more than 1 chip and 6 indicating 10–24chips. The chip is reported as (recoat chip)(chip quantity).

Sag—Sag resistance was tested on a 4″×18″ panel with pre-cut holes, ontowhich was sprayed the basecoat followed by a wedge of clearcoat suchthat the film thickness covered a range of approximately 0.5 to 2.5mils. The clearcoat was allowed to air flash at ambient temperature for5 minutes in a vertical position and then baked for 30 minutes at 141°C., (285° F.) in a vertical position. The sag resistance was rated bymeasuring the film build at the point at which the clearcoat has saggedbelow the hole for approximately 0.5–1 cm.

Pop—Pop resistance was tested on a 4″×18″ panel onto which was sprayedthe basecoat followed by a wedge of clearcoat, such that the filmthickness covered a range of approximately 0.5 to 2.5 mils. Theclearcoat was allowed to air flash at ambient temperature for a maximumof 30 seconds in a horizontal position and then baked for 30 minutes at155° C. (310° F.) in a horizontal position. The pop resistance was ratedby measuring the film build at the threshold point of pop. The point ofpop is where the solvent blisters are distinctly apparent across thewidth of the cured panel.

VOC—The determination of the volatile organic compound content (VOC) ofeach sample was done using (ASTM D3960).

TABLE 46 Coating Test Ex. R Ex. S Ex. T Ex. U Total Solids (wt. %) 45.848.7 44.7 41.7 VOC (wt. %) 4.5 4.3 4.6 4.8 20° Gloss 88.6 88.6 88.8 89.3Mar 90.3 92.2 91.8 90.6 Water Spot 3 3 2.5 3 Acid Spot 2/5.5 1/5.51.5/5.5 1/5.5 Chip B6 B6 B6 B5 Adhesion 100% 100% 100% 100% Sag 1.52 1.71.56 1.62 Pop 0.45 <0.6 1.44 1.19

The data demonstrate that good coating properties that result when thecoating composition of the present invention is used in an aminoplastcrosslinked basecoat system.

EXAMPLE 15

A blocked isocyanate crosslinker was prepared as described in below fromthe ingredients in Table 47.

TABLE 47 Parts by Weight Ingredients (in grams) Isophorone Diisocyanate1110.0 Methylisobutyl ketone 160.0 Dibutyltin dilaurate 1.0Trimethylolpropane 156.4 Caprolactam 735.8 Propylene glycol 7.6Methylisobutyl ketone 280.0

Isophorone diisocyanate, dibutyltin dilaurate, and methylisobutyl ketonewere charged to a reactor and a temperature of 25° C. was established.The trimethylolpropane was added to the reactor in two equal parts. Uponaddition of the first charge of trimethylolpropane, the temperatureincreased to 50° C. After completion of the second trimethylolpropaneaddition, the temperature increased to 96° C. The reactor was thencooled to 80° C. The caprolactam was then added in two portions. Afterholding the reaction for two hours at 110° C., the propylene glycol wasadded and the reaction was held until infrared analysis indicated theabsence of isocyanate. After the isocyanate was consumed, the secondaddition of methylisobutyl ketone was made.

A thermoset electrodepositable sulfonium functionaldiisobutylene/acrylic resin was prepared as described below from theingredients in Table 48.

TABLE 48 Parts by Weight Ingredients (in grams) Acrylic-diisobutylenepolymer of 1310.0 Example 8-DD Thiodiethanol 366.0 Lactic Acid 81.8Urethane Crosslinker described above 662.5 Deionized Water 54.0Deionized Water 1784.2 Deionized Water 1353.5

The diisobutylene-acrylic polymer was charged to a reaction vessel andheated to 80° C. Thiodiethanol, the first charge of deionized water, andlactic acid were then added to the reaction vessel. The reaction mixturewas then held at 80° C. for 5 hours. At this point, urethane crosslinkerwas added to the reactor. After mixing for 15 minutes, the resin wasdispersed into the second charge of deionized water which was at 25° C.After mixing for 30 minutes, the dispersion was reduced to its finalsolids with the third charge of deionized water. The dispersion had anon-volatile content of 20.3%.

An electrodepositable coating composition, in the form of anelectrodeposition bath, was prepared as described below from theingredients in Table 49.

TABLE 49 Ingredient Parts by weight Electrodepositable resin of 1079.4described in Table 48 CA926³⁰ 5.3 Deionized water 1115.3 n-hexylethyleneglycol³¹ 22.0 ³⁰A catalyst paste available from PPG Industries, Inc.³¹HEXYL CELLOSOLVE ® solvent available from Dow Chemical Co.

The resin described in Table 48 was reduced with approximately 500 gramsof deionized water in a 2500 milliliter glass beaker and was agitatedthoroughly using a magnetic stirrer and stir bar. The CA-926 catalystpaste was reduced with approximately 100 grams of deionized water andstirred thoroughly. This mixture was then added to the resin/water blendwhile under agitation. The, remaining water was then added to the paintbath followed by the slow addition of the HEXYL CELLOSOLVE. Theresulting paint bath had a pH of 4.95 and a conductivity of 570microsiemens. The paint bath was allowed to stir overnight prior toelectrodeposition.

Testing of Electrodepositable Coating Composition

The electrodepositable coating composition was applied over a 4″×12″zinc phosphated cold rolled steel panel available as APR 10739 from ACTLaboratories, Inc., Hillsdale, Mich. Prior to coat out the bathcomposition was heated to a temperature of 110° F. Electrodeposition wascarried out at 50 volts for 120 seconds. The panel was then cured for 30minutes at 350° F. These conditions yielded 0.57 mils of film. Film curewas tested by rubbing the coated panels with an acetone soaked rag.Following 100 acetone double rubs (back and forth) there was nonoticeable effect on the coated film, indicating good cure.

EXAMPLE 16

This example demonstrates resistance to surface contamination when thepresent isobutylene type copolymers are used in a thermoset clearcoatcomposition.

A commercial, solvent-borne, thermoset clearcoat (OFDCT 8000, availablefrom PPG Industries) was treated with 3% of the polymer of example 8-AA.The polymer was incorporated by thorough mixing into a sample of thecommercially produced clear coat.

Commercially available electrocoated 4″×12″ steel panels were spotcontaminated with 0.1 to 0.2 microgram, quantities of a series ofpolymers with varying surface tension. The two samples of the treatedand one untreated clear coats were spray applied onto identically spotcontaminated test panels. The clearcoat was applied in two coats with asixty second flash in between, flashed for 10 minutes at ambientconditions and baked for 30 minutes at 285° F. The dry film thicknesseswere 1.6–1.8 mils.

The ability of each clear coat to cover each of the contaminant polymerswithout leaving a visible defect has been correlated to its craterresistance. Each contaminant spot was rated against a set of arbitrarilydefined standards. Typical ratings for each clear coat, with 100 as aperfect score, are as follows:

Rating OFDCT 8000 untreated 57 FDCT 8000 + 3% additive 89Recoat adhesion was equal for the treated and untreated clear coats.

EXAMPLE 17

This example demonstrates resistance to surface contamination when thepresent isobutylene type copolymers are used in a thermoset clearcoatcomposition.

A commercial, solvent-borne, thermoset clearcoat (DC5001, available fromPPG Industries) was treated with 3% of the polymer of example 8-BB. Thepolymer was incorporated by thorough mixing into a sample ofcommercially produced clear coat.

Commercially available electrocoated 4″×12″ steel panels were spotcontaminated with 0.1 to 0.2 microgram quantities of a series ofpolymers with varying surface tension. Two treated and one untreatedclear coats were spray applied onto identically spot contaminated testpanels. The clearcoat was applied in two coats with a sixty second flashin between, flashed for 10 minutes at ambient and baked for 30 minutesat 285° F. Dry film thicknesses were 1.6–1.8 mils.

The ability of each clear coat to cover each of the contaminant polymerswithout leaving a visible defect has been correlated to its craterresistance. Each contaminant spot was rated against a set of arbitrarilydefined standards. Typical ratings for each clear coat, with 100 as aperfect score, are as follows:

Rating DC5001 untreated 58 DC5001 + 3% additive 72Recoat adhesion was equal for the treated and untreated clear coats.

EXAMPLE 18

This example demonstrates the use of the present isobutylene typecopolymers in a powder coating formulation, which is a grindable solidthat forms a cured film when baked. The powder coating composition wasprepared using the ingredients shown in Table 50.

TABLE 50 Materials Example V (g) Polymer of example 8-CC 7.0 Hydroxyalkylamide³² 4.7 Degasser³³ 0.1 Flow Agent³⁴ 0.1 ³²Primid QM-1260, EMSPrimid, Sumpter, S.C. ³³Benzoin, Ura Flow B, Estron Chemical, CalvertCity, KY. ³⁴Resiflow PL-200, Monsanto.

Each component was mixed sequentially in a container. The mixture wasthen poured onto a heated 175° C. hot plate and stirred with a spatulauntil fluid. The mixture was then placed into a container and allowed tocool. Once cooled, it was ground into a fine powder using a mortar andpestle. The test substrate was ACT cold roll steel panels, 10.16cm×30.48 cm (4″×12″) available as APR10433 from ACT Laboratories, Inc.,Hillsdale, Mich. The powder coating was dusted onto the surface of thesteel: panel which was placed on the 175° C. hot plate. As the powderbegan to flow, a straight edge was used to draw down the coating tocover the surface of the panel. The panel was then place into a 375° F.oven for 30 minutes and cured.

Gel point determination was measured on the powder coating as it washeated on the surface of a 175° C. hot plate. Time is measured from thepoint when the powder melts to the point it gels, i.e., forms a solid.The time is measured in minutes and seconds. When a powder starts tocure, it will begin to string. The flat part of the tongue depressor ispushed into the molten powder and pulled upward, roughly every 15seconds until the melt no longer strings and the timer is stopped. Thisis the gel point determination. A shorter period of time to reach a gelpoint is preferred.

Methyl ethyl ketone (MEK) rub solvent resistance was used to determinethe cure of the paint. Cheesecloth was moistened with MEK and, withmoderate pressure, at a rate of about 1 double rub per second, rubbedover the painted panel until the coating becomes damaged. This test istypically run to 100 double rubs or failure of the coating, which everoccurs first. The higher the number of rubs, the better the cure of thecoating. Table 51 shows the test results.

TABLE 51 Example V Gel Point 30 Seconds Mek double rubs >100

The results demonstrate the good results achieved when the presentisobutylene type copolymers are used in a, powder coating formulation.

EXAMPLE 19

This example demonstrates the generally poor results observed whenpoly(isobutylene-alt maleic acid) type polymers are formulated into aclearcoat system. The maleic acid polymer was prepared using theingredients shown in Table 52.

TABLE 52 Parts by weight Ingredients (grams) Charge 1 Poly(isobutylene-alt-maleic 200.00 anhydride)³⁵ Charge 2 M-pyrol 400.00Charge 3 DiH2O 54.00 ³⁵Mw ca. 60.000, Aldrich Chemical Company,Milwaukee, WI

Charges 1 and 2 were mixed until completely dissolved. Then Charge 3 wasadded and the mixture heated to 90° C. and held for 7 hours. The reactorwas then cooled to 25° C. The solids of the resulting polymer were 45.6%determined at 110° C. for one hour. The resin had an acid value of115.35.

A clearcoat was formulated by sequentially mixing each component inTable 53 with agitation.

TABLE 53 Example Example Materials X Y Methyl N-Amyl Ketone 25 ButylEther Diethylene Glycol Acetate 5.0 N-Amyl Alcohol 4.1 Methanol 32.0 GMAAcrylic Resin³⁵ 87.89 86.1 Acid Functional Crosslinker³⁶ 63.69 Poly(isobutylene-alt maleic acid) 97.84 ³⁵50% glycidyl methacrylate, 0.2%methyl methacrylate, 7% styrene, 2.0% diphenyl-2, 4; methyl-4;pentene-1, 40.8% n-butyl methacrylate, 66% solids in 8/74/18 w/wodorless mineral spirits/Aromatic 100/methyl ether propylene glycolacetate. ³⁶83/17 w/w methylhexahydrophthalic anhydride/pentaerythritol,68% solids in 51/49w/w n-propanol/n-amyl propionate.

The test substrate was ACT cold roll steel panels 10.16 cm×30.48 cm(4″×12″) available as APR28215 from ACT Laboratories, Inc., Hillsdale,Mich. The clear coating compositions of examples X and Y were applied tothe panels at ambient temperature using an 8-path Wet Film Applicator,#14 available from Paul N. Gardner Company, Inc. Dry film thickness wastargeted for about 30 micrometers, 1.6 mils., Panels prepared from eachcoating were baked for 30 minutes at 141° C.

MEK rub solvent resistance, as described in example 18 was used toevaluate the cure of the paint. The results are shown in Table 54.

TABLE 54 Comparative X Example Y Mek Double Rubs 20 1

The results show the generally inferior results that are found when adifunctional acid acceptor monomer, such as maleic acid is used as acomonomer with isobutylene type acceptor monomers and formulated into aclearcoat system.

EXAMPLE 20

This example demonstrates the effect of diisobutylene content on thesolids level, VOC content and crater resistance in a melaminecrosslinked solventborne clearcoat system.

Each component in Table 55 was mixed sequentially with agitation. Thefinal viscosity was adjusted with 1/1/1 w/w Aromatic 100(ExxonMobil)/methyl n-amyl ketone/xylene and 4/1 w/w methyl n-amylketone/2-butoxy ethanol acetate to 27 seconds measured on a #4 Ford cup(Paul N. Gardner Company) at room temperature (71°–72° F.).

TABLE 55 Ex Z Ex AA Ex BB Ex CC Ex DD Ex EE Material (g) (g) (g) (g) (g)(g) MAK 7.3 7.3 7.3 7.3 7.3 7.3 Xylene 2.2 2.2 2.2 2.2 2.2 2.2 Aromatic100¹¹ 7.5 7.5 7.5 7.5 7.5 7.5 EGMHE 0.7 0.7 0.7 0.7 0.7 0.7 Ethanol 3.33.3 3.3 3.3 3.3 3.3 Amino Resin¹² 49.9 Amino Resin¹³ 40.0 40.0 40.0 40.040.0 Acrylic Resin** 73.8 Polymer of 78.5 Example 6-P Polymer of 62.1Example 6-Q Polymer of 64.8 Example 6-R Polymer of 67.1 Example 6-SPolymer of 78.5 Example 6-T Catalyst¹⁴ 1.0 1.4 1.4 1.4 1.4 1.4 Aromatic100¹¹ 6.0 0.0 6.0 2.6 3.0 0.0 MAK 6.0 0.0 6.0 2.6 3.0 0.0 Xylene 6.0 0.06.0 2.6 3.0 0.0 MAK 14.4 0.0 14.4 6.4 7.2 0.0 2-Butoxy ethanol 3.6 0.03.6 1.6 1.8 0.0 acetate **Prepared in 10/46/44 w/w isobutylalcohol/Aromatic 100/xylene using 2,2′-azobis-(2-methyl butyronitrole)(Vazo-67, DuPont). Monomer composition m/m 40% HPA, 1.0% MMA, 19% NBA,18% NBMA, 20% Styr, 2% AA; 71 wt. % polymer solids. ¹¹Exxon MobileCorp., Fairfax, VA ¹³Resimene ® 757, Solutia, St. Louis. MO ¹³Resimene ®755, Solutia ¹⁴Cycat ® Catalyst 600, Cytec Industries(dodecylbenzylsulfonic acid)

The clear coating compositions shown in Table 55 were applied using an8-path. Wet Film Applicator, #14 available from Paul N. Gardner Company,Inc., to black electrodeposition primed panels (cold rolled steel panels4″×12″, available as APR28215 from ACT Laboratories, Inc.) at ambienttemperature. The dry film thickness was targeted for about 30 m (1.6mils). The coated panels were baked for 30 minutes at 141° C.

Physical properties were measured as follows:

Percent solids according to ASTM Test Method D 2369;

20° Gloss as outlined in example 10;

Distinction of Image (DOI) as outlined in example 10;

Volatile Organic Compound (VOC) content as outlined in ASTM Test MethodD3960; and

Craters was determined as outlined in example 11. The results are shownin Table 56.

TABLE 56 Coating Test Ex Z Ex AA Ex BB Ex CC Ex DD Ex EE Percent solids51.4 63.1 55.9 59.2 61.6 63.9 20° Gloss 92.2 86.6 86.6 87.0 86.7 85.9DOI 96 96 96 96 96 95 VOC 4.0 3.2 3.6 3.3 3.2 3.0 Craters 1.0 55 60 7682 85

The data demonstrate that increasing diisobutylene content generallyimproves percent solids (higher), VOC (lower) and crater resistancewhile not adversely affecting other properties.

EXAMPLE 21

This example demonstrates the effect of including other acceptormonomers in the present isobutylene containing copolymers on theproperties of a melamine crosslinked solventborne clearcoat systemcontaining them.

Each component in Table 57 was mixed sequentially with agitation. Thefinal viscosity was adjusted with 1/1/1 w/w Aromatic 100(ExxonMobil)/methyl n-amyl ketone/xylene and 4/1 w/w methyl n-amylketone/2-butoxy ethanol acetate to 27 seconds measured on a #4 Ford cup(Paul N. Gardner Company) at room temperature (71°–72° F.).

TABLE 57 Ex FF Ex GG Ex HH Ex II Ex JJ Ex KK Ex LL Material (g) (g) (g)(g) (g) (g) (g) MAK 7.3 7.3 7.3 7.3 7.3 7.3 7.3 Xylene 2.2 2.2 2.2 2.22.2 2.2 2.2 Aromatic 100¹¹ 7.5 7.5 7.5 7.5 7.5 7.5 7.5 EGMHE 0.7 0.7 0.70.7 0.7 0.7 0.7 Ethanol 3.3 3.3 3.3 3.3 3.3 3.3 3.3 Amino Resin¹² 49.9Amino Resin¹³ 40.0 40.0 40.0 40.0 40.0 40.0 Acrylic Resin** 73.8 Polymerof 72.6 Example 7-U Polymer of 72.4 Example 7-V Polymer of 73.9 Example7-W Polymer of 72.3 Example 7-X Polymer of 66.0 Example 7-Y Polymer of76.5 Example 7-Z Catalyst¹⁴ 1.0 1.4 1.4 1.4 1.3 1.3 1.4 Aromatic 100¹¹6.0 1.7 2.7 2.0 2.7 9.2 9.7 MAK 6.0 1.7 2.7 2.0 2.7 9.2 9.7 Xylene 6.01.7 2.7 2.0 2.7 9.2 9.7 MAK 14.4 4.0 6.4 4.8 6.4 22.1 23.2 2-Butoxy 3.61.0 1.6 1.2 1.6 5.5 5.8 ethanol acetate **Prepared in 10/46/44 w/wisobutyl alcohol/Aromatic 100/xylene using 2,2′-azobis-(2-methylbutyronitrole) (Vazo-67, DuPont). Monomer composition m/m 40% HPA, 1.0%MMA, 19% NBA, 18% NBMA, 20% Styr, 2% AA; 71 wt. % polymer solids.¹¹Exxon Mobile Corp., Fairfax, VA ¹³Resimene ® 757, Solutia, St. Louis.MO ¹³Resimene ® 755, Solutia ¹⁴Cycat ® Catalyst 600, CytecIndustries(dodecylbenzyl sulfonic acid)

The clear coating compositions shown in Table 58 were applied using an8-path Wet Film Applicator, #14 available from Paul N. Gardner Company,Inc., to black electrodeposition primed panels (cold rolled steel panels4″×12″, available as APR28215 from ACT Laboratories, Inc.) at ambienttemperature. The dry film thickness was targeted for about 30 μm (1.6mils). The coated panels were baked for 30 minutes at 141° C.

Physical properties were measured as follows:

Percent solids according to ASTM Test Method D 2369;

20° Gloss as outlined in example 10;

Distinction of Image (DOI) as outlined in example 10;

Volitile Organic Compound (VOC) content as outlined in ASTM Test MethodD3960; and

Craters was determined as outlined in example 11. The results are shownin Table 58.

TABLE 58 Coating Test Ex FF Ex GG Ex HH Ex II Ex JJ Ex KK Ex LL % solids51.4 61.2 60.6 61.0 59.2 49.3 49.3 20° Gloss 92 85 86 87 89 82 86 DOI 9696 96 96 95 89 94 Craters 1 77 75 77 52 74 70

The data demonstrate that when other acceptor monomers are included inthe present isobutylene containing copolymers, acceptable melaminecrosslinked solventborne clearcoat coating compositions and coatingsresult, with improved crater resistance.

The present invention has been described with reference to specificdetails of particular embodiments thereof. It is not intended that suchdetails be regarded as limitations upon the scope of the inventionexcept insofar as and to the extent that they are included in theaccompanying claims.

1. A multi-component composite coating composition comprising: (a) a base coat deposited from a pigmented film-forming composition; and (b) a transparent top coat applied over said base coat, wherein said transparent top coat is deposited from a clear film-forming thermosetting composition comprising: (i) a copolymer composition comprising segments comprised of alternating residues derived from a donor monomer composition comprising one or more monomers selected from the group consisting of isobutylene, diisobutylene, dipentene, isoprenol, and an acceptor monomer composition comprising acrylic monomers, and monomers containing functional groups, wherein said copolymer composition is substantially free of transition metals, Lewis acids, maleate-type monomer residues, and fumarate-type monomer residues; and (ii) a crosslinking agent having at least two functional groups that are reactive with the functional groups of the copolymer in (i).
 2. The multi-component composite coating composition of claim 1, wherein the clear thermosetting composition is a liquid solution mixture of (i) and (ii).
 3. The multi-component composite coating composition of claim 1, wherein the clear thermosetting composition is a solid particulate mixture of (i) and (ii).
 4. A substrate coated with the multi-component composite coating composition of claim
 1. 5. A multi-component composite coating composition comprising: (a) a primer coat deposited by electrocoating a conductive substrate serving as a cathode in an electrical circuit comprising said cathode and an anode, said cathode and anode being immersed in an aqueous electrocoating composition, comprising passing electric current between said cathode and anode to cause deposition of the electrocoating composition on the substrate as a substantially continuous film; (b) a base coat deposited from a pigmented film-forming composition; and (c) a transparent top coat applied over said base coat, wherein said transparent top coat is deposited from a clear film-forming thermosetting composition comprising: (i) a copolymer composition comprising segments comprised of alternating residues derived from a donor monomer composition comprising one or more monomers selected from the group consisting of isobutylene, diisobutylene, dipentene, isoprenol, and an acceptor monomer composition comprising acrylic monomers, and monomers containing functional groups, wherein said copolymer composition is substantially free of transition metals, Lewis acids, maleate-type monomer residues, and fumarate-type monomer residues; and (ii) a crosslinking agent having at least two functional groups that are reactive with the functional groups of the copolymer in (i).
 6. The multi-component composite coating composition of claim 5, wherein the clear thermosetting composition is a liquid solution mixture of (i) and (ii).
 7. The multi-component composite coating composition of claim 5, wherein the clear thermosetting composition is a solid particulate mixture of (i) and (ii).
 8. A substrate coated with the multi-component composite coating composition of claim
 5. 